Nerve Fiber - Motor Fibers of The A Group

Motor Fibers of The A Group

A alpha fibers
  • Characteristics:
    • High conduction velocity
    • By alpha motor neuron for muscle contraction.
    • Alpha motor neurons innervate extrafusal muscle fibers (slow and fast fibers)
A beta fibers
  • Characteristics:
    • By beta motor neuron for muscle spindle fibers contraction.
    • Beta motor neurons innervate intrafusal muscle fibers of muscle spindles (nuclear bag and nuclear chain fibers), with collaterals to extrafusal muscle fibers.
A gamma fibers
  • Characteristics:
    • By gamma motor neuron for muscle spindle fibers contraction.
    • Gamma motor neurons innervate intrafusal muscle fibers of muscle spindles (nuclear bag and nuclear chain fibers).

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