Anatomy & Physiology · Chapter 16

The Neurological Exam

A skilled doctor or nurse can find the exact spot where the nervous system has broken. It might be one nerve, a strip of spinal cord, or one side of the brain. All they need is a pin, a tuning fork, a flashlight, and some well-chosen questions. That is the quiet magic of the neurological exam. It turns the outside of a patient into a window on the inside.

In this chapter you will walk through its five parts in the same order an examiner does. You will go from the thinking cortex down to the walking feet. Along the way you will learn the one habit that makes it all work. It is called localization. It means working back from a finding to the part of the nervous system that caused it.

By the end of this chapter you can

Explain the goal of the neurological exam, which is to localize a problem at the bedside. Name its five main parts in order.
Do the mental status exam. Match the main language areas (Broca’s and Wernicke’s) to the aphasia that damage to each one causes.
List the twelve cranial nerves. Describe the quick bedside test for each one.
Use dermatome landmarks to find a sensory level. Tell apart the two sensory pathways that run up to the brain: the spinothalamic tract and the dorsal columns.
Grade muscle strength on the 0–5 scale. Tell upper from lower motor neuron weakness.
Do the cerebellar coordination tests. Explain dysmetria, ataxia, and a positive Romberg sign.
Work back from any one finding to the region of the nervous system behind it.

Section 1The exam, part by part

A tightrope walker keeping balance, which takes the whole nervous system — **Reference.** A tightrope walker. Balance and coordination need the whole nervous system working at once — OpenStax, CC BY 4.0 (via Wikimedia Commons)

An exam that localizes

Most exams in medicine ask what is wrong. The neurological exam adds a second, sharper question: where? The nervous system is wired in a neat, mapped-out way. One region handles language. One nerve runs the tongue. One strip of skin belongs to one spinal segment. So a careful examiner can take a handful of findings and point to a single place. That skill is called localization, and it is the whole game.

Here is an example. A weak right arm, slurred speech, and a drooping right face all point to the left side of the brain. A numb band around the belly points to one level of the spinal cord. In a way, the exam is a scanner made of questions. Long before MRI scans existed, this is how brain doctors (neurologists) found the problem spot, or lesion.

The five parts, from top to bottom

The exam is easiest to remember as a trip down the nervous system. It goes from the highest thinking to simple walking. Each part checks a different level. So a problem in one part tells you roughly where to look.

Part	What it tests	Points to
1. Mental status	Alertness, knowing where and when you are, memory, language	The cerebral cortex
2. Cranial nerves	Vision, eye movement, face, hearing, tongue: the twelve nerves	The brainstem and the nerves themselves
3. Sensory	Touch, pain, temperature, vibration, position	A spinal nerve, the cord, or a sensory pathway
4. Motor	Strength, tone, muscle size (and reflexes)	The motor pathway: upper vs lower motor neuron
5. Coordination & gait	Smooth movement, balance, walking	The cerebellum

Notice how neatly the parts stack up. Mental status and language live in the cortex at the top. The cranial nerves come out of the brainstem in the middle. Sensory and motor tests check the long pathways of the spinal cord and the nerves in the body. Coordination checks the cerebellum, tucked at the back of the brain. Reflexes are usually part of the motor exam. Do the parts in order, and you have checked the nervous system from head to toe.

Findings first, scanner second. A good neuro exam predicts what the scan will show before it is taken. A scan confirms a location. The exam chooses which location to scan. That is why doctors and nurses still learn to do it by hand.

Tap through the five parts in the interactive. Watch each one light up the region it points to.

Interactive Tap each of the five parts of the exam to see the region it points to. Open full ↑

Key points

The neuro exam is for localizing a problem at the bedside. You work back from a finding to a region.
It has five parts: mental status, cranial nerves, sensory, motor, coordination & gait. Together they check the nervous system from top to bottom.
Each part matches a level: cortex, brainstem, cord and nerves, motor pathway, and cerebellum.

Section 2Mental status & language

Broca and Wernicke language areas on the side of the brain — **Reference.** Broca’s and Wernicke’s language areas, joined by a bundle of fibers called the arcuate fasciculus — OpenStax, CC BY 3.0 (via Wikimedia Commons)

Reading the cortex

The mental status exam checks the brain's highest-level work. That work happens in the cerebral cortex, the brain's wrinkled outer layer. The exam checks if the patient is awake and alert. It checks if they know who they are, where they are, and what time it is. It also checks attention and memory. Most telling of all, it checks language.

You do not need a formal test to start. A two-minute chat already tells you a lot. Is the person confused? Can they find their words? Do they follow what you say? When something is off, the pattern points to a certain patch of cortex. That is because different jobs live in different places.

The two language areas, and the aphasias

Language is lateralized, which means it lives mostly on one side of the brain. In nearly everyone, that is the left side. Language is split between two areas with two different jobs. Broca’s area is in the frontal lobe, just in front of the motor strip. It produces speech. It builds words and grammar. Wernicke’s area is in the temporal lobe, near the hearing area. It understands language. It attaches meaning to words.

Damage to each area causes a very different aphasia, or loss of language. The type of aphasia tells you just which area failed.

Area	Its job	If damaged
Broca’s area	Produces speech (words, grammar)	Broca’s (expressive) aphasia: slow, hard, choppy speech with few small words. The patient still understands. They know their speech is wrong and feel frustrated.
Wernicke’s area	Understands language (meaning)	Wernicke’s (receptive) aphasia: smooth-flowing but meaningless “word salad.” The patient cannot understand. They often do not realize anything is wrong.
Prefrontal cortex	Executive function: judgment, planning, personality, self-control	Acting without a filter, poor judgment, personality change (the famous story of Phineas Gage)
Hippocampus	Makes new long-term memories	Anterograde amnesia: cannot make new memories, though old ones remain

Here is an easy way to keep them straight. Broca’s is Broken speech. The words come out slowly and with effort. But the mind behind them is clear and aware. Wernicke’s is Wordy nonsense. The speech flows easily. But the meaning is gone, both coming in and going out.

Testing is simple. To check speech output, ask the patient to name objects and repeat a phrase. To check understanding, give a command they must follow. For example: “Point to the ceiling, then the door.” To check short-term memory, name three words. Ask for them back a few minutes later. This is a bedside test of the hippocampus.

Smooth but empty is the danger sign. People with Wernicke’s aphasia speak smoothly. They also don’t know they have a problem. So their condition is easy to miss. They may be mistaken for confused, or even for having a mental illness. Always test understanding, not just whether the words flow.

Tap each region in the interactive. See its language job and the aphasia that damage there causes.

Interactive Tap a region of the cortex to see its language job and the aphasia that damage there causes. Open full ↑

Key points

The mental status exam checks the cortex. It tests alertness, orientation, memory, and above all, language.
Language is usually on the left side (lateralized). Broca’s area produces speech. Wernicke’s area understands it.
Broca’s aphasia: hard, slow speech, understanding intact, patient frustrated. Wernicke’s aphasia: smooth nonsense, understanding lost, patient unaware.

Section 3The cranial nerve exam

The twelve cranial nerves on the underside of the brain — **Reference.** The twelve cranial nerves coming out of the underside of the brain — OpenStax, CC BY 4.0 (via Wikimedia Commons)

Twelve nerves, twelve tests

Twelve pairs of cranial nerves leave the underside of the brain. They serve the head and neck. They handle smelling, seeing, moving the eyes, and feeling the face. They also handle hearing, tasting, swallowing, speaking, and turning the head. Most of them come from the brainstem. So testing them one by one is a way to check the brainstem from top to bottom.

The exam has a rhythm to it. Each nerve has one quick bedside test. If a test fails, it points straight to that nerve. Or it points to the part of the brainstem the nerve comes from.

Nerve	How it is tested
I — Olfactory	Name a familiar smell (coffee, mint) with eyes closed, one nostril at a time
II — Optic	Sharpness of vision (eye chart), side vision, and how the pupil reacts to light
III — Oculomotor	Pupil shrinking to light and most eye movements. A wide, fixed pupil or a drooping lid (ptosis) points to CN III.
IV — Trochlear	Look down and in toward the nose. Weakness causes up-and-down double vision, often noticed on stairs.
V — Trigeminal	Feeling on the face in three zones. Clench the jaw to feel the chewing muscle (masseter).
VI — Abducens	Look laterally (out to the side). If it fails, the eye cannot turn out.
VII — Facial	Smile, raise the eyebrows, puff the cheeks. A droop on one side signals a facial nerve problem (such as Bell’s palsy).
VIII — Vestibulocochlear	Hearing (a whisper or finger rub) and balance. Tuning-fork tests add detail.
IX — Glossopharyngeal	The gag reflex and taste at the back of the tongue (tested along with CN X)
X — Vagus	Say “ahh.” The soft palate and uvula should rise evenly on both sides. Also check voice and swallowing.
XI — Accessory	Shrug the shoulders and turn the head while you push back (trapezius & SCM muscles)
XII — Hypoglossal	Stick out the tongue. It points toward the weak (damaged) side.

Small signs, precise meaning

The best part of the cranial nerve exam is how much a tiny difference between sides can tell you. Say the tongue pokes out crooked, leaning toward the bad side. That points to CN XII on that side. A soft palate that lifts unevenly points to CN X. A pupil that will not shrink in light, along with a droopy lid, hints at CN III. In the right setting, that is an emergency.

For years, students have kept the twelve nerves in order with an old memory trick: “On Old Olympus’ Towering Tops, A Finn And German Viewed Some Hops.” Each first letter stands for a nerve, from I to XII.

It leans toward the damage. Two classic signs point at the damaged side. The tongue (CN XII) leans toward the weak side. In a facial nerve (CN VII) palsy, the mouth droops on the weak side. The healthy side pulls the face away from it. Watch which way things sag.

Tap any of the twelve nerves in the interactive. See how it is tested and what a failed test would mean.

Interactive Tap any of the twelve cranial nerves to see how it’s tested and what a failed test means. Open full ↑

Key points

The twelve cranial nerves serve the head and neck. Most come from the brainstem, so testing them checks the brainstem.
Each nerve has one quick test. Examples are smell, the eye chart, a jaw clench, “ahh,” a shoulder shrug, and sticking out the tongue.
The tongue (XII) and a facial droop (VII) lean toward the damaged side.

Section 4The sensory exam

Map of the dermatomes over the whole body — **Reference.** The dermatome map. Each spinal nerve serves its own strip of skin — OpenStax, CC BY 4.0 (via Wikimedia Commons)

Skin comes in strips

Each spinal nerve carries feeling from one band of skin. This band is called a dermatome. Side by side, the dermatomes cover the whole body like the stripes on a map. That map is very useful. Say a patient has numbness in one strip. You can read the strip backward to the exact spinal level that serves it.

You do not have to memorize all thirty or so dermatomes. A handful of reliable landmarks anchors the whole map. The rest fall into place between them.

Level	Landmark
C6	The thumb and the thumb side of the forearm
C7	The middle finger (C7 also powers the triceps)
C8	The little finger and the pinky side of the forearm
T4	The nipple line
T10	The umbilicus (belly button)
L1	The groin (inguinal area)
L4	The inner knee and shin (L4 powers the knee-jerk)
L5	The top of the foot and big toe (L5 lifts the foot up, called dorsiflexion)
S1	The little toe and sole (S1 powers the ankle-jerk)

Two roads to the brain

Feeling does not travel on one channel. It travels on two. The neuro exam tests them apart because they take different routes. They also cross the midline in different places. The midline is the imaginary line down the middle of the body.

Pain and temperature ride the spinothalamic tract. This pathway crosses to the other side almost at once, right inside the spinal cord. Fine touch, vibration, and position sense (proprioception) ride the dorsal columns. These stay on the same side all the way up. They cross only high up, in the medulla of the brainstem.

Since they cross in different spots, one cord injury can cause a strange pattern. It can knock out one sense on one side of the body and the other sense on the other side. This pattern tells you right away that both pathways are involved.

Pathway	Carries	Crosses	Tested with
Spinothalamic tract	Pain & temperature	In the cord (right away)	Pinprick, warm or cold
Dorsal columns	Touch, vibration, position	In the medulla (high up)	Tuning fork, sensing toe position

Anchor the trunk with two numbers. T4 at the nipple, T10 at the umbilicus. Remember just those two. Then you can estimate any chest-level (thoracic) segment by counting ribs up or down. A band of numbness at the belly button says “think T10.”

Tap a landmark in the interactive to find its spinal level. Then compare the two pathways that carry feeling up to the brain.

Interactive Tap a dermatome landmark to find its spinal level. Open full ↑

Key points

A dermatome is the strip of skin served by one spinal nerve. Numbness in a strip points to that spinal level.
Landmarks to learn: C6 thumb, C7 middle finger, C8 little finger, T4 nipple, T10 umbilicus, L1 groin, S1 sole.
There are two pathways. The spinothalamic tract carries pain and temperature and crosses in the cord. The dorsal columns carry touch, vibration, and position and cross in the medulla.

Section 5The motor exam

The corticospinal motor pathway from brain to spinal cord — **Reference.** The corticospinal (pyramidal) motor pathway, with its upper and lower motor neurons — OpenStax, CC BY 3.0 (via Wikimedia Commons)

Grading strength, zero to five

The motor exam starts by measuring strength. The examiner checks one muscle group at a time. They use a standard scale that runs from 0 to 5. Gravity is the key to the scale. Grade 3 is the turning point. A 3 means the limb can just lift against gravity, but not against any extra push. Above 3, muscles can hold against your push. Below 3, they cannot even beat gravity.

It is worth learning the scale exactly. Writing “4/5” in a chart says something precise. Another doctor or nurse can act on it.

Grade	What it means
5	Normal power: full strength against full push
4	Moves against gravity and some push, but weaker than normal
3	Moves against gravity only: can lift the limb, but not against a push
2	Moves only with gravity taken away (sliding side to side)
1	A flicker or trace of muscle squeeze, but the joint does not move
0	No muscle squeeze at all: complete paralysis

Where does the weakness come from?

The motor pathway has two relays. The upper motor neuron (UMN) runs from the motor cortex down the corticospinal tract to the spinal cord. The lower motor neuron (LMN) runs from the cord out along a nerve to the muscle. Weakness can come from either one. The exam tells them apart by the other signs that come with the weakness.

UMN damage takes away the brain's control over the cord below it. So the muscle becomes spastic (stiff) and its reflexes get too strong. LMN damage cuts the muscle's only lifeline. So the muscle goes flaccid (limp). It wastes away and twitches. Checking tone, reflexes, and muscle size turns “this arm is weak” into “the problem is here.”

Sign	Upper motor neuron	Lower motor neuron
Location	Brain → spinal cord	Spinal cord → muscle
Tone	Higher (spastic, stiff)	Lower (flaccid, limp)
Reflexes	Stronger than normal (hyper)	Weaker or missing
Babinski sign	Present (big toe goes up)	Absent
Atrophy (muscle wasting)	Little, and late	A lot, and early
Fasciculations	Absent	Present (twitches you can see)

Up means upper. Stroke the sole of the foot. If the big toe turns up, that is the Babinski sign. It is a hallmark of an upper motor neuron problem. It is also normal in babies. That is because their corticospinal tract has not finished getting its fatty coating (myelin). In a healthy adult, the toes should curl down.

Slide through the strength scale in the interactive. Then switch views to compare the two motor neuron patterns.

Interactive Slide the 0–5 strength scale. Then compare upper and lower motor neuron signs. Open full ↑

Key points

Strength is graded 0–5. Grade 3 is the turning point: the limb moves against gravity but not against a push.
The pathway has two relays: upper (cortex → cord) and lower (cord → muscle) motor neurons.
UMN: stiff, strong reflexes, Babinski present, little wasting. LMN: limp, weak reflexes, early wasting, twitches.

Section 6Coordination & gait

The cerebellum at the back of the brain — **Reference.** The cerebellum, the brain’s coordination center — OpenStax, CC BY 4.0 (via Wikimedia Commons)

The smoothness check

Strength moves a limb. The cerebellum makes the movement smooth, accurate, and well-timed. The last part of the exam tests that polish. A patient can be fully strong and still not touch their own nose cleanly. That is because the cerebellum fine-tunes aim and keeps balance steady.

When the cerebellum fails, movements overshoot, wobble, and stagger. This group of signs is called ataxia. Each cerebellar test checks one piece of coordination.

Test	What it checks	Abnormal finding
Finger-to-nose	How well you aim	Dysmetria (overshooting or undershooting) and an intention tremor that gets worse near the target
Rapid alternating movements	Switching a movement back and forth smoothly	Dysdiadochokinesia: clumsy, uneven switching
Heel-to-shin	Leg coordination	A heel that wobbles off track: limb ataxia
Romberg test	Proprioception (position sense)	Steady with eyes open, but falls with eyes closed. This is a sensory (dorsal-column) problem.
Gait	Overall balance and walking	A wide-based, staggering (ataxic) walk points to the cerebellum
Pronator drift	Mild upper motor neuron weakness	One arm slowly drifts down and turns palm-down. This is an early UMN sign.

The Romberg trap

One test in this group is a clever detective. It is not a cerebellar test at all. In the Romberg test, the patient stands with feet together and closes their eyes. Balance depends on three inputs. They are vision, the inner ear, and proprioception. Proprioception is the dorsal-column sense of where your limbs are.

Closing the eyes takes vision away. Then the body must rely on the other two. Say a patient is steady with eyes open but sways or falls with eyes closed. That is a positive Romberg. It points to a sensory (dorsal-column) problem, not the cerebellum. A person with a true cerebellar problem is unsteady either way. The cerebellum never relied on the eyes to begin with. This small test neatly separates two very different causes of poor balance.

Romberg is a sensory test in disguise. Falling only with the eyes shut means the problem is proprioception, not coordination. If someone is unsteady even with eyes open, look to the cerebellum instead.

Tap each test in the interactive. See what an abnormal result reveals.

Interactive Tap each cerebellar test to see what an abnormal result reveals. Open full ↑

Key points

The cerebellum makes movement smooth and accurate. When it fails, you get ataxia: dysmetria, intention tremor, and a wide-based walk.
Key tests are finger-to-nose, rapid alternating movements, heel-to-shin, gait, and pronator drift.
A positive Romberg (falling only with eyes closed) is a proprioception/dorsal-column sign. It is not a cerebellar sign.

The chapter in one breath

The neuro exam is for localizing a problem at the bedside. Its five parts check the nervous system from top to bottom.
Mental status checks the cortex. Language is mostly on the left. Broca’s aphasia means hard, slow speech in an aware patient. Wernicke’s aphasia means smooth nonsense in an unaware patient.
The twelve cranial nerves check the brainstem, each with one quick test. The tongue and a facial droop lean toward the damage.
A dermatome points to a sensory level (T4 nipple, T10 umbilicus, S1 sole). Pain and temperature travel the spinothalamic tract. Touch, vibration, and position travel the dorsal columns.
Strength is graded 0–5. Upper motor neuron problems are stiff, with strong reflexes and a Babinski sign. Lower motor neuron problems are limp, wasted, and twitchy.
The cerebellum makes movement smooth. When it fails, you get ataxia. A positive Romberg is a sensory sign, not a cerebellar one.
Every finding is a clue to a place. The whole exam is the skill of working back from a sign to a region.

ReferenceWords worth knowing

Here is a quick list of the terms in this chapter. Skim it now, or come back whenever a word trips you up.

Aphasia: A loss of language caused by damage to a language area of the cortex. The type depends on which area failed.
Ataxia: Clumsy, uncoordinated movement, with overshooting, wobbling, and staggering. It usually comes from a cerebellum problem.
Babinski sign: The big toe moves up when the sole is stroked. In adults, it is a sign of an upper motor neuron problem. It is normal in babies.
Broca’s area: The part of the frontal lobe that produces speech. Damage causes slow, choppy speech (expressive aphasia), but understanding stays intact.
Cranial nerves: The twelve pairs of nerves that leave the underside of the brain to serve the head and neck.
Decussation: When a nerve pathway crosses from one side of the body to the other. For example, the dorsal columns cross in the medulla.
Dermatome: The strip of skin whose feeling is carried by one spinal nerve. Together the dermatomes cover the body like a map.
Dorsal columns: The pathway that carries fine touch, vibration, and position sense up to the brain. It crosses high up, in the medulla.
Dysdiadochokinesia: Clumsy, uneven rapid back-and-forth movements. It is a cerebellar sign.
Dysmetria: Poor aim when reaching, overshooting or undershooting a target. It shows up on the finger-to-nose test in cerebellar disease.
Flaccid: Limp, with low muscle tone. It is typical of a lower motor neuron problem.
Localization: Working back from the pattern of exam findings to the part of the nervous system that is causing them.
Lower motor neuron (LMN): The neuron that runs from the spinal cord out along a nerve to the muscle. Damage causes limp weakness, wasting, and twitches (fasciculations).
Mental status exam: The part of the neuro exam that tests the cortex. It checks alertness, orientation, attention, memory, and language.
Pronator drift: With eyes closed, an arm held straight out slowly drifts down and turns inward. It is an early sign of upper motor neuron weakness.
Proprioception: Your sense of where your limbs and body are in space. The dorsal columns carry it, and the Romberg test checks it.
Romberg test: Standing with feet together and eyes closed. A fall points to a position-sense (dorsal-column) problem, not a cerebellar one.
Spasticity: Higher muscle tone, so the muscle resists being moved. It is typical of an upper motor neuron problem.
Spinothalamic tract: The pathway that carries pain and temperature up to the brain. It crosses to the other side almost at once, inside the spinal cord.
Upper motor neuron (UMN): The neuron that runs from the motor cortex down the corticospinal tract to the cord. Damage causes stiff weakness, strong reflexes, and a Babinski sign.
Wernicke’s area: The part of the temporal lobe that understands language. Damage causes smooth but meaningless speech, and understanding is lost.

Check yourself

1. What one goal ties the whole neurological exam together? What is the name of the skill it depends on?

To find where in the nervous system the problem is. The skill is called localization. The nervous system is mapped in a neat way. So a pattern of findings can be traced back to one region. That is what every part of the exam is really testing.

2. Name the five parts of the neuro exam in order. Give the region each one mainly points to.

Mental status (cortex) → cranial nerves (brainstem) → sensory (spinal nerve, cord, pathways) → motor (upper vs lower motor neuron) → coordination & gait (cerebellum). The order walks down the nervous system, from the highest thinking to walking.

3. A patient speaks slowly and with great effort, in short, choppy phrases. They clearly understand everything you say and seem frustrated. Which language area is damaged? What is this aphasia called?

Broca’s area. This is Broca’s (expressive) aphasia. Broca’s area produces speech, so losing it makes speaking hard. But understanding (Wernicke’s area) is intact. That is just why the patient knows something is wrong.

4. Another patient speaks smoothly and easily, but the sentences are meaningless “word salad.” The patient seems unaware anything is wrong. Which area is damaged? Why are they unaware?

Wernicke’s area. This is Wernicke’s (receptive) aphasia. Wernicke’s area understands language. Losing it takes away the ability to understand speech, even the patient’s own. So they speak smoothly but do not notice their mistakes.

5. How would you quickly test cranial nerve XII (hypoglossal)? Which way does the tongue point if one side is weak?

Ask the patient to stick out their tongue. It points toward the weak (damaged) side. The strong side pushes the tongue over toward the weak side. This small difference points to the problem.

6. You want to test cranial nerve X (vagus) at the bedside in one move. What do you ask the patient to do? What should you see?

Ask the patient to say “ahh.” Watch the soft palate and uvula rise evenly on both sides. An uneven lift signals a vagus (CN X) problem. The vagus also controls voice and swallowing.

7. A patient has a band of numbness right around the umbilicus (belly button). Which spinal level does this point to? What landmark sits at T4?

T10 is at the umbilicus. T4 is at the nipple line. With these two trunk landmarks, you can estimate any chest level by counting ribs up or down.

8. Pain and temperature travel on one pathway. Touch, vibration, and position travel on another. They cross the midline in different places. Name each pathway and where it crosses.

Pain & temperature → spinothalamic tract, which crosses in the cord (right away). Touch, vibration & position → dorsal columns, which cross in the medulla (high up). Because they cross in different places, one cord injury can affect the two kinds of feeling on opposite sides of the body.

9. On the 0–5 strength scale, what does a grade of 3 mean? Why is 3 the key dividing line?

Grade 3 means the limb moves against gravity only, but not against a push. Three is the turning point of the scale. At 3 or above, the muscle can lift the limb against gravity. Below 3, it cannot even beat gravity.

10. Two patients are weak. One has stiff muscles, strong reflexes, and a big toe that goes up. The other has limp, wasting muscles that twitch. Is each an upper or lower motor neuron problem?

Stiff + strong reflexes + Babinski = upper motor neuron. Limp + wasting + twitches (fasciculations) = lower motor neuron. UMN damage frees the cord below from the brain's control, so it becomes overactive. LMN damage cuts the muscle’s lifeline, so the muscle becomes underactive and wastes away.

11. What exactly is the Babinski sign? What does it mean in an adult?

The big toe moves up when the sole is stroked. In an adult, it means an upper motor neuron problem. A healthy adult’s toes curl down. The upward toe is normal only in babies, before the corticospinal tract has its full myelin coating.

12. A patient stands steadily with eyes open but falls when they close their eyes (positive Romberg). Is this a cerebellar problem? Explain.

No. A positive Romberg is a proprioception (dorsal-column) sensory problem, not a cerebellar one. Closing the eyes takes away vision. That exposes a loss of position sense. A person with a true cerebellar problem is unsteady even with eyes open, because the cerebellum never relied on vision.

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