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Skeletal Muscle
Parts of
Structure | Description | Function |
---|---|---|
Skeletal Muscle | Voluntary, Striated, Multinucleated | Articular Movement/Support and Posture (anti-gravitational) |
Muscle Mass | Organ Level | Tendons: attach Muscle to Bone; superficial Fascia: connective tissue; Blood Vessels and Nerves |
Muscle Fibers | Multinucleated, Striated, Uni-directional | bound by a Sarcolemma membrane and supplied with a branch of 1 motor nerve |
Myofibril | Sub-cellular | 1000/cell |
Myofilament | Molecular Level - made of Myosin: Thick protein filament; and Actin: Thin protein filaments | Sliding Filament Action: Myosin cross-bridges pull Actin over Myosin ---> shortening Sarcomere unit (contraction) |
Sarcomere | section from z-line to another | contains1 Myofilament/section of Myosin and Actin |
Z-line | anchors within the Myofilament | Stabilize the filament |
Tendon | Inelastic cord; made of Dense REGULAR connective tissue | connecting MUSCLE to BONE |
Aponeurosis | a Wide, FLAT tendon | connecting MUSCLE to MUSCLE |
Retinaculum | a Ligamentous band | holding TENDONS in place, providing a Point of LEVERAGE |
Epimysium | (Superficial Fascia) Dense, IRREGULAR connective tissue sheath | around entire Muscle Mass |
Perimysium | INTERNAL Fascia | binding parallel fibers, forming FASCICULI |
Endomysium | RETICULAR connective tissue | Between Fibers |