Muscle Tissue Muscle Cells Function u Contraction n

Muscle Tissue

Muscle Cells Function u Contraction n Aggregation of muscle cells u Muscle tissue n Voluntary and involuntary movements n

Muscle Tissue Striated u Skeletal and heart (cardiac) muscle n Non-striated u Smooth muscle (viscera and blood vessels) n

Muscle Cell: Terms Sarcolemma u Cell membrane n Sarcoplasm u Cytoplasm of a muscle cell n Myofilament u Single, contractile fiber u Myosin (thick filament) or actin (thin filament) n

Muscle Cell: Terms n n Myofibril u Numerous arrangement of both types of myofilaments Muscle fiber u Contains numerous myofibrils Muscle fasciculus u Contains numerous muscle fibers Sarcomere u The functional unit of the myofibril

Muscle Fascicles Muscle fibers Myofibril (sarcomeres) Myofilament (actin & myosin)

Skeletal Muscle n 3 layers of connective tissue u Endomysium u Perimysium u Epimysium

Histology of Skeletal Muscle n Skeletal muscle fibre (cell): u Extremely long cell u Multiple nuclei lying at the periphery of the cell u Cross- striations: actin and myosin filaments which are found in the cytoplasm

Skeletal Muscle

Cardiac Muscle Small cells with one or two centrically placed nuclei n Branch and anastomose n Cell rows joined by intercalated discs n

Cardiac Muscle

Skeletal muscle VS Heart muscle

Smooth Muscle n Fusi-form shaped cells, single nucleus

Summary Muscle tissue u Skeletal muscle, heart muscle and smooth muscle u Contraction n Categories u Striated and non-striated muscle n Proteins u Actin & myosin n