Intrafusal muscle fiber
Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors). They detect the amount and rate of change in length of a muscle. They constitute the muscle spindle, and are innervated by both sensory (afferent) and motor (efferent) fibers.
| Intrafusal muscle fiber | |
|---|---|
A muscle spindle, with γ motor and Ia sensory fibers | |
| Details | |
| Part of | Skeletal muscle |
| Function | Proprioception |
| Identifiers | |
| Latin | myofibra intrafusalis |
| TH | H3.03.00.0.00012 |
| Anatomical terms of microanatomy | |
Intrafusal muscle fibers are not to be confused with extrafusal muscle fibers, which contract, generating skeletal movement and are innervated by alpha motor neurons.
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