BIOL 1410 Lecture Notes - Lecture 11: Epicranial Aponeurosis, Skeletal Muscle, Myocyte
15 Dec 2015
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Produce movement by contracting by-product = heat: skeletal muscle. Whole muscle = group of fascicles: ct components of skeletal muscle, fascia = ct, epimysium surrounds entire muscle, perimysium surrounds fascicles, endomysium surrounds each muscle fiber, tendons + aponeuroses. Anchors to bone (periosteum), cartilage, skin, or fascia. Tendon = rope-like: e. g. achilles tendon. Aponeurosis = sheet-like: e. g. galea aponeurotica = epicranial aponeurosis, skeletal muscle fiber structure. Parts: sarcolemma = cell membrane, sarcoplasm = cytoplasm, myofibrils (intracellular structures) Composed of sarcomeres: sarcomere structure (composed of proteins): made of 2 types of myofilaments, thin filaments: Composed of: actin functions in contraction. 1: tropomyosin + iii. troponin regulate contraction (regulatory proteins) f, thick filaments. Composed of: myosin functions in contraction. Has rod-like tail with 2 globular heads: head extends toward actin forms crossbridge, the myofilaments create dark + light bands, banding pattern: (striations) of the sarcomere. Dark = length of thick filament myosin.
