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Skeletal Muscle

Parts of

StructureDescriptionFunction
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
Created by: kristel387