BIOL 1412 Lecture Notes - Lecture 11: Epicranial Aponeurosis, Skeletal Muscle, Myocyte
6 Jun 2017
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Fascia = ct: epimysium surrounds entire muscle, perimysium surrounds fascicles, endomysium surrounds each muscle fiber. Tendons + aponeuroses extensions of epi-, peri-, + endomysium anchors to bone (periosteum), cartilage, skin, or fascia tendon = rope-like: e. g. achilles tendon. 1 actin functions in contraction tropomyosin + iii. troponin i. ii. regulate contraction (regulatory proteins) f b) thick filaments. Composed of: i. myosin functions in contraction. Has rod-like tail with 2 globular heads: head extends toward actin and attaches to it. Forming a crossbridge: the myofilaments create dark + light bands (striations) of the sarcomere, banding pattern: a) b) c) d) e) Dark = length of thick filament myosin + actin (with troponin + tropomysosin) Lighter band at center of a band myosin only. Light = actin (with troponin + tropomyosin) + titin. Connect sarcomeres: between 2 z-discs = 1 sarcomere. = smooth er triad = 2 enlarged areas of sr (terminal cisternae) & t-tubule: how muscles produce movement.
