MUSCLE PHYSIOLOGY

Detailed explanation-1: -The outermost connective tissue sheath surrounding the entire muscle is known as epimysium. The connective tissue sheath covering each fasciculus is known as perimysium, and the innermost sheath surrounding individual muscle fiber is known as endomysium.

Detailed explanation-2: -The endomysium is the key element that separates single muscle fibres from one another. It allows their autonomous gliding during muscle contraction. The endomysium is also a highly deformable tissue that adapts itself to the changes of volume that occur during the muscle fibre contraction.

Detailed explanation-3: -The epimysium is a thick connective tissue layer that is composed of coarse collagen fibers in a proteoglycan matrix. The epimysium surrounds the entire muscle and defines its volume. The arrangement of collagen fibers in the epimysium varies between muscles of different shapes and functions.