KP222 Lecture Notes - Lecture 13: Skeletal Muscle, Skeleton, Muscular System
10 Feb 2019
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Document Summary
Di er from autonomic pathways: both anatomically and functionally. Single neuron originating in cns which projects axons to target tissue: always skeletal muscle. Skeletal muscles: are attached to the skeletal system, muscular system = skeletal muscles. Function: produce skeletal movement, maintain body position, support soft tissue, guard opening, maintain body temperature, store nutrient reserves, note: satellite cells di erentiate into muscle. Epimysium: exterior collagen layer, connected to deep fascia (structure of ct, separates muscles form surrounding tissues, pictures. Perimysium: surrounds muscle bre bundles (fascicles, contains blood vessel & nerve supply to fascicles, picture. Endomysium: surrounds individual muscle bres, contains capillaries & nerve bers contacting muscle cells, contains myosatellite cells (stem cells) that repair damage, picture. Endomysium, perimysium, and epimysium come together at ends of muscle to form tendon (bundle) or aponeurosis (sheet) Size: 3-4 inches in length, 0. 05 -0. 15 mm wide, each fascicles holds 100-150 bres. Develop through fusion of mesodermal cells (myoblasts)
