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Notes: Skeletal Muscle Anatomy. (1) Levels of Organization Muscle (whole organ) Fascicle (portion of muscle) Muscle Fiber (single muscle cell) Myofibril.

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Presentation on theme: "Notes: Skeletal Muscle Anatomy. (1) Levels of Organization Muscle (whole organ) Fascicle (portion of muscle) Muscle Fiber (single muscle cell) Myofibril."— Presentation transcript:

1 Notes: Skeletal Muscle Anatomy

2 (1) Levels of Organization Muscle (whole organ) Fascicle (portion of muscle) Muscle Fiber (single muscle cell) Myofibril (muscle cell organelle) Sarcomere (portion of myofibril) Myofilament (part of sarcomere) Macroscopic Microscopic

3 Muscle (organ) Fascicle Muscle Fiber (cell) Muscle Fiber (with many nuclei) Myofibril Sarcomere Thin Filament (actin) Thick Filament (myosin)

4 (2) Muscle Organ of muscular system Contains: –Muscle Cells –Connective Tissue –Blood Vessels & Nerves –Contractile Units Covered By: –Epimysium (outer tissue-membrane)

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6 (3) Fascicle Portion of muscle-organ One step down from whole muscle Relationships: –Bunch of Fascicles = Muscle –Fascicle = Bunch of Muscle Fibers

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8 (4) Muscle Fiber Actual Muscle Cell Contains: –Multiple nuclei –Striations –Complex organelles called myofibrils Relationships: –Bunch of Muscle Fibers = Fascicle –Muscle Fiber = Bunch of Myofibrils & Nuclei

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11 (5) Myofibril Organelle in a muscle cell Contains: –Contractile Units (Sarcomere) Relationships: –Bunch of Myofibrils = Muscle Fiber –Myofibril = Bunch of Sarcomere

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13 (6) Sarcomere Portion of myofibril Contains: –Contractile proteins –Thin filaments with actin –Thick filaments with myosin Relationships: –Bunch of Sarcomeres = Myofibril –Sarcomere = Bunch of Myofilaments (Actin + Myosin)

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15 (7) Myofilaments Contractile portions of sarcomere Types: –Thin filaments w/actin (type of protein) –Thick filaments w/myosin (type of protein) Relationships: –Bunch of Myofilaments = Sarcomere –Myofilaments = DO THE CONTRACTIONS

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