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MUSCLE I Types of muscle A Striated muscle 1 Skeletal muscle voluntary muscle http cal vet upenn edu histo muscle skeletal html 2 Cardiac muscle heart muscle http www ttuhsc edu courses cbb histo muscle pg08jp html II Basic components of muscle cell organization A sarcolemma plasmalemma of muscle cells well developed basement membrane Sarcolemmal tubular invaginations called transverse tubules associated with the sarcoplasmic reticulum B sarcoplasm cytoplasm of muscle cells excluding the myofibrils C sarcoplasmic reticulum smooth endoplasmic reticulum of muscle cells D sarcomere basic contractile unit of a myofilament myofibril skeletal and cardiac muscle only E sarcosome specialized long mitochondrion found skeletal and cardiac muscle only F myofibril or myofilament a string of sarcomeres skeletal and cardiac muscle only G myofiber a single muscle cell II Basic components of muscle cell organization H epimysium thick layer of collagenous connective tissue that surrounds large bundles of muscle I perimysium collagenous connective tissue continuous with epimysium that separates fascicles of muscle cells J fascicle bundle of muscle cells myofibers bounded by perimysium K endomysium very thin layer of connective tissue that separates individual muscle cells fascicle perimysium http training seer cancer gov module anatomy unit4 2 muscle structure html III Skeletal voluntary muscle http www siumed edu dking2 ssb NM016b htm A As just described epimysium perimysium and endomysium surrounds the components of skeletal muscle as B Skeletal muscle is connected to bone a tendon C Individual muscle cells are syncytial multinucleate Nuclei at periphery of cell D Each individual muscle cell is called a muscle fiber myofiber Within the sarcoplasm of these cells are numerous myofilaments myofibrils http www finchcms edu anatomy histology histology muscle h m 8 htm III Skeletal voluntary muscle E The myofilaments myofibrils are linear arrays of structures known as sarcomeres



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