chp 9 - Muscular system Chapter 9 Basic Components Skeletal...

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Unformatted text preview: Muscular system Chapter 9 Basic Components Skeletal muscle (myo)* (cardiac and smooth later) Connective tissue* Functions Body movement (w/bones) Stabalizing upright posture Producing heat (e.g. shivering) Skeletal muscle Basic unit = fiber fusion of 100+ myoblasts during devt. cannot replicate satellite cells can produce new muscle fibers 1 somatic neuron & blood vessels Bundles of 10-100 fibers = fascicles Bundles of fascicles = muscle Fig. 9.1 Fig. 9.3 Connective tissue Deep fascia dense irregular Holds groups of muscles w/ similar function together Epimysium (d. irr.) surrounds a muscle Perimysium (d. irr.) surrounds fascicles Endomysium (areolar) surrounds fibers Fig. 9.1 Connective tissue Epi- Peri- & Endomysium extend beyond end of muscle fuse Connect muscle to muscle/bone thick band tendon thin sheet aponeurosis focus on movement Most involved in producing movement Contract tension on tendons pull on bones/skin Muscle attachments Attachment to stationary bone Origin Usu. proximal Attachment to moving bone Insertion Usu. distal Muscle btwn attachments belly Levers...
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chp 9 - Muscular system Chapter 9 Basic Components Skeletal...

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