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EX 14. Skeletal Muscle Most numerous Voluntary Striated Gives you shape, allows for facial expressions, movement, and manipulation.

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Presentation on theme: "EX 14. Skeletal Muscle Most numerous Voluntary Striated Gives you shape, allows for facial expressions, movement, and manipulation."— Presentation transcript:

1 EX 14

2 Skeletal Muscle Most numerous Voluntary Striated Gives you shape, allows for facial expressions, movement, and manipulation

3 Cells of the Skeletal Muscle Long cylindrical cells called fibers Multinucleated Composed of myofibrils Myofilaments Made of actin and myosin alternating to produce the banding pattern (I and A bands) Sacrolema- plasma membrane Sacroplasm- cytoplasm

4 Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Skeletal Muscle Fibers Figure 10–2a The Formation of a Multinucleate Skeletal Muscle Fiber.

5 Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Skeletal Muscle Fibers Figure 10–2 The Formation of a Multinucleate Skeletal Muscle Fiber.

6 Sarcomeres Contractile units Made up of bundles of myofibrils Extend from middle of I band to middle of next myofibril

7 Organization of Skeletal Muscle Cells into Muscles Endomysium – areolar connective tissue sheath that covers muscle fibers Perimysium – encloses sheathed muscle Fascicle-bundle of perimysium Epimysium-bundle of fasciles Epimysium blend into deep fascia Fascia blends into tendons

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9 Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Skeletal Muscle Structures Figure 10–1 The Organization of Skeletal Muscles.

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11 Tendons provide durability and conserve space Provide route of entry for blood vessels

12 Neuromuscular Junction Junction between a nerve fiber and a muscle cell Axons stimulate many muscle fibers Both neuron and muscle fibers make up the motor unit Neurotransmitters cause a change in Na and K concentration which causes muscle contraction

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