1. Histologically identifying characteristics of 3 types of muscle
    • 1) Skeletal:
    • multinucleate; obvious striations

    • 2) Cardiac:
    • less obviously striated; intercalated discs

    • 3) Smooth Muscle:
    • dense bodies; kind of look like a pack of ghosts
  2. What are the striations on skeletal muscles?
    The dark bands (A-bands) are where the actin and myosin overlap one another

    The light bands (I bands) are where there is only actin (off of the z lines)
  3. What are the three types of CT associated with skeletal muscle?
    1) Endomysium: Surrounds a muscle fibre (cell)

    2) Perimysium: Surrounds a muscle fasicle

    3) Surrounds muscle

    All are connected with one another and extend beyond the muscle to the tendon. Makes tendons very deeply rooted.
  4. What are the differences between red, white, and intermediate muscle fibres.
    Red (type I): good for posturing, LOTS of myoglobin, many mitochondria, mostly oxidative phosphor., slow twitch

    White (Type IIa, intermediate): 400m race, oxidative and anaerobic, the most mitochondria, fast twitch, intermediate

    White (Type IIb): 10s sprint, anaerobic, low myoglobin, lots of glycogen, easily fatigable, fast twitch
  5. What is the function and location of satellite cells in muscle? What happens if they run out?
    They are myogenic stem cells located between basal lamina and plasma membrane. They either become new muscle nuclei or mother satellite cells. When depleted: patholigic conditions like muscular dystophy.
  6. Skeletal muscle location and function.
    Location:  attached to skeleton; some visceral (e.g. tongue, diaphram, esophagus)

    Function: Locomotion, heat, breathing, swallowing,
  7. Describe the blood and nervous supply to muscle.
    • Blood:
    • Main artery is deep (with V and N) -> branch arteries go along perimysium -> these branch arteries send capillaries into endomysium (capp.'s are usually parallel to fibre)

    Nerve: axon branches and supplies many fibres at the NMJs. One branch for each fibre.
  8. Label muscle spindle
    Image Upload 1
  9. Label Golgi tendon organ
    • Image Upload 2
    • Uses the stretch of collagen fibres instead of intrafusal muscle
  10. Label the NMJ
    Image Upload 3
  11. How do muscles regenerate?
Card Set
Muscle Histology