Type II sensory fiber
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Type II sensory fiber (group Aβ) is a
Type II sensory fiber (group Aα) is another type of sensory fiber, which participate in the sensation of body position (proprioception).[5] In each muscle, we have 10-100 tiny muscle-like pockets called muscle spindles. The type II fibers (aka secondary fibers) connect to nuclear chain fibers and static nuclear bag fibers in muscle spindles, but not to dynamic nuclear bag fibers. The typical innervation to muscle spindles consists of one type Ia fiber and 2 type II fibers.[6] The type Ia fiber has "annulospiral" endings around the middle parts of the intrafusal fibers compared to type II fibers that have "flower spray" endings which may be spray shaped or annular, spreading in narrow bands on both sides of the chain or bag fiber.[7] It is thought that the Ia fibers signal the degree of change in muscle movement, and the type II fibers signal the length of the muscle (which is later used for forming the perception of the body in space).
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