Structure and organization of Skeletal Muscle
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10 Terms
What is a muscle
The organ - A muscle consists of hundred to thoudands of muscle cells, plus CT wrappings, blood vessels, and nerve fibers
What CT wrappings wrap a muscle externally
Covered externally by the epimysium
What is a fascicle
A portion of the muscle - A discrete bundle of muscle cells, segregated from the rest of the muscle by a CT sheath
What wraps the fascicles
Perimysium
What is a muscle fiber
The cell - an elongated multinucleate cell; it has banded (striations) appearance
What wraps a muscle fibers
Endomysium
What is a myofibril
Rodlike contractile elements that occupy most of the muscle cell volume. Composed of sarcomeres arranged end to end, they appear banded, and bands of adjacent myofibrils are aligned
What wraps myofibrils
Nothing
What is a sarcomere
The contractile unit, composed of myofilaments made up of contractile proteins
What is a myofilament, or filament
They are of two types - thick and thin. Thick myofilaments are myosin. Thin myofilaments are actin plus other proteins (troponin and tropomyosin). The sliding of thin filaments past thick filaments allows for contracting / muscle shortening.