医学英语-MUSCULAR SYSTEM-医学课件.ppt

Cardiac Muscle Smooth Muscle Non-striated Spindle-shaped cells Single nucleus that is centrally located Involuntary Found mainly in the walls of hollow organs Smooth Muscle Striated Multinucleate cells that are peripherally located Voluntary Attached to bone of skeleton Skeletal Muscle Skeletal Muscle Striation Structure of Skeletal Muscle Fascia Fascia [?f??i:?] 筋膜 Fascicle [?f?sikl] 肌束 Myofibril [?mai?u?faibril] 肌原纤维 Skeletal Muscle 3 layers of connective tissue Epimysium Perimysium Endomysium Epimysium [?epi?mizi?m] 肌外膜 Perimysium [?peri?mizi?m] 肌束膜 Endomysium [?end?u?mizi?m] 肌内膜 Skeletal Muscle Fiber Cell – multinucleate Nuclei – just beneath the sarcolemma Sarcolemma – specialized plasma membrane Sarcoplasm – cytoplasm of muscle cells Sarcolemma [?sɑ:k??lem?] 肌纤维膜 Sarcoplasm [?sɑ:k??pl?z?m] 肌质 Distinct bands I band = light band A band = dark band Myofibril Contractile unit of a muscle fiber Sarcomere Z disk – a darker area in middle of I band – Extend from Z disk to Z disk Sarcomere [?sɑ:k?mi?] 肌节 Myofilament [?mai?u?fil?m?nt] 肌丝 Sarcomere I band – Distance between two thick filaments – Contains only thin filaments A band – Length of thick filament – Overlap with thin filaments H zone – At center of A band – Contains only thick filaments M line – Middle of the H zone Actin filaments Myosin filaments Myofilaments Actin [??ktin] 肌动蛋白 Myosin [?mai?usin] 肌球蛋白 Levels of Functional Organization in a Skeletal Muscle Fiber * go * go * go * go * go * go * go * go * go * go * go * go * go * go * Cramps attributed to lack of water or other electrolyte imbalance in relation to muscle fatigue * go * go * go * go * go * go * go Muscular System