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)
- 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.
- 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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