Primary afferent ending — Free Physiology Illustration | GPAI | GPAI

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Primary afferent ending — Free Physiology Illustration | GPAI | GPAI

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Primary afferent ending

Primary afferent ending

Physiology

Primary afferent ending

A large sensory nerve ending wrapped in a tight spiral or annulospiral pattern around the central swollen region of an intrafusal muscle fiber. The ending appears as a relatively thick, smooth pale yellow or tan nerve fiber forming closely spaced looping coils that encircle the middle of the fiber.

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