A muscle is bundles inside bundles inside bundles. Each one is wrapped in its own sheet of connective tissue. Zoom in from the whole muscle down to the tiny unit that actually shortens: the sarcomere.
Whole muscle
Whole musclezoom in, level by level
Zoom the levels
📷 Reference image
A real labeled figure to compare with the interactive above.
Muscle Organization — OpenStax, CC BY 4.0 (via Wikimedia Commons)
