Ch9 Le1

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  • Ch9 Le1

    1. 1. Chapter 9: Muscular System Lecture #1
    2. 2. What is Moebius syndrome? <ul><li>Absence of the sixth and seventh cranial nerves which carry impulses from the brain to the muscles of the face </li></ul><ul><li>Symptoms? </li></ul>difficulty: sucking swallowing squinting eyes moving tongue smiling
    3. 3. What treatment did Chelsey Thomas receive? <ul><li>Underwent two ‘smile’ surgeries </li></ul><ul><li>At 7yo, transplant of nerve and muscle tissue from legs to either side of her mouth </li></ul>
    4. 4. 3 Types of Muscle Tissue <ul><li>Skeletal Muscle Tissue </li></ul><ul><li>Cardiac Muscle Tissue </li></ul><ul><li>Smooth Muscle Tissue </li></ul>
    5. 5. Skeletal Muscle Tissue <ul><li>Tissues you’ll find in skeletal muscle </li></ul>Skeletal Muscle Tissue Nervous Tissue Blood Connective Tissue dense c.t. blood vessels nerves muscle fibers with motor neurons
    6. 6. Structure of a Skeletal Muscle <ul><li>Connective Tissue Coverings </li></ul>Fascia: -separates individual muscle -holds muscle in position -dense c.t. -projects beyond muscle to form tendon
    7. 7. Structure of a Skeletal Muscle <ul><li>Connective Tissue Coverings </li></ul>Tendon: -may intertwine with periosteum
    8. 8. Structure of a Skeletal Muscle <ul><li>Connective Tissue Coverings </li></ul>Tendons : muscle to bone attachment Aponeuroses : fibrous sheets attaching to bone or to other muscle
    9. 9. Tendinitis & Tenosynovitis <ul><li>Green box on p. 286 </li></ul><ul><ul><li>What is it & what causes it? </li></ul></ul><ul><ul><li>Where is it most commonly found? </li></ul></ul>inflamed or swolen tendon due to injury or repeated stress shoulder, elbow, hip, knee movement of wrist, hand, thigh, foot
    10. 10. Structure of a Skeletal Muscle <ul><li>Epimysium </li></ul><ul><li>Perimysium </li></ul><ul><li>Endomysium </li></ul>Myofibril muscle fascicle Muscle fiber
    11. 11. C.T. Functions <ul><li>E </li></ul><ul><li>P </li></ul><ul><li>E </li></ul><ul><ul><li>Functions: allows parts to move somewhat independently </li></ul></ul><ul><ul><li>Also, blood vessels and nerves pass through these layers </li></ul></ul>erimysium ndo mysium pi mysium
    12. 12. Compartmentment Syndrome <ul><li>Green box on p. 286 </li></ul><ul><ul><li>What is it? </li></ul></ul><ul><ul><li>What is the treatment? </li></ul></ul>pressure on a muscle enclosed in connective tissue due to a hemmorage surgery to relieve pressure
    13. 13. Fascia layers (c.t. layers) <ul><li>Fascia is interconnected throughout body to </li></ul><ul><ul><li>Deep fascia: surrounds muscle </li></ul></ul><ul><ul><li>Subcutaneous fascia: just beneath the skin </li></ul></ul><ul><ul><li>Subserous fascia: c.t. layer of serous memb over organs and in body cavities </li></ul></ul>
    14. 14. Structure of a Skeletal Muscle <ul><li>C.T. coverings </li></ul><ul><li>Skeletal Muscle Fibers </li></ul>2. Aponeurosis & Tendons 1. Fascia 3. Epimysium Perimysium Endomysium 4. fascicles
    15. 15. Structure of a Skeletal Muscle <ul><li>Skeletal Muscle Fibers </li></ul>A B C D
    16. 16. Structure of a Skeletal Muscle <ul><li>Skeletal Muscle Fibers </li></ul>
    17. 17. Structure of a Skeletal Muscle <ul><li>A Single Muscle Cell = Muscle ________ </li></ul><ul><li>Forms from many undifferentiated cells that fuse during development </li></ul><ul><li>CHARACTERISTICS: </li></ul><ul><ul><li>MULTINUCLEATED </li></ul></ul><ul><ul><li>THIN </li></ul></ul><ul><ul><li>ELONGATED CYLINDER WITH ROUNDED ENDS </li></ul></ul>fiber
    18. 18. Structure of a Skeletal Muscle A Muscle Fiber
    19. 19. <ul><li>Sarcomeres connected end-to-end make up ______________ </li></ul><ul><li>Functional unit of muscle contraction = _______________ </li></ul><ul><li>Striation pattern </li></ul>myofibrils sarcomere I-Bands A-Bands

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