MUSCLE PHYSIOLOGY

Detailed explanation-1: -A skeletal muscle fascicle consists of 20 to 60 fibers surrounded by a connective tissue sheath. A single muscle fiber is innervated by only one motor unit, but there may be two to three motor units within a fascicle. The muscle fibers of one motor unit may be distributed over 100 fascicles.

Detailed explanation-2: -Approximately 20–80 of these muscle fibers are grouped together in a parallel arrangement called a muscle fascicle or fiber bundle that is encapsulated by a perimysium, which is thicker than the epimysium enclosing each of the bundled muscle fibers.

Detailed explanation-3: -Fascicles can be parallel, circular, convergent, pennate, fusiform, or triangular. Each arrangement has its own range of motion and ability to do work.