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Ch9 Le1
 

Ch9 Le1

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Ch9 Le1 Ch9 Le1 Presentation Transcript

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