Question

SECTION 1: Structure of a Skeletal Muscle A. Layers of connective tissue separate a muscle into compartments. The layer called endomy- sium surrounds each muscle cell. Muscle cells are then bundled into fascicles, which are sur- rounded by perimysium. The entire muscle is composed of many fascicles, and is surround- ed by epimysium. All layers merge together to form the tendon that attaches the muscle to a bone. An outermost layer of connective tissue called fascia binds adjacent muscles together into functional groups, such as the flexors and extensors of the forearm. Label the parts of the skeletal muscle in Figure 10.1. Refer to your textbook as a guide. Bone Skeletal muscle Muscle fiber (cell) Figure 10.1. Skeletal muscle structure 1. tendon Arendon Epimysium Endomysium Perimysium Fascicle 2. 3. 4.

Answer 1

Ans . 1. Tendon : A cord of dense regular connective tissue composed of parallel bundle of collagen fibres that attach a muscle to the periosteum of a bone. An example is the calcaneal ( Achilles) tendon of gastrocnemius ( calf) muscle ,which attach to muscle to the calcaneus.

When connective tissue elements extend as a broad , flat layer, the tendon is called aponeurosis.

2. Epimysium :three layers of connective tissue extend from the deep fascia to protect and strengthen skeletal muscle . The outer most layer , encircling the entire muscle is epimysium ( Fibrous elastic tissue ) .

3. Endomysium: connective tissue which covers each muscle fibre or myofiber of muscle cell. Penetrating the interior of each fascicle and seperating individual muscle fibre from one another is endomysium . A thin sheath of areolar connective tissue .

4. Perimysium : connective tissue that surrounds group of 10 to 100 or more muscle fibres , seperating them into bundles called Fascicles. Many Fascicles are large enough to be seen with nacked eye.

both epimysium or perimysium are dense irregular connective tissue .

5. Fascicle: Connective tissue surrounds and protects muscular tissue i.e. Fascia is a sheet or broad band of fibrous connective tissue that supports and surrounds muscles and other organs of the body .

the superficial fascia ( subcutaneous layer of hypodermis) , which seperates muscle from skin .

the deep fascia is dense irregular connective tissue that lines the body wall and limbs and holds muscles with similar function together .