Group Aα type II sensory fiber tonically convey
proprioceptive information regarding static muscle stretch/length from
nuclear chain intrafusal fibers of
muscle spindles which function as
stretch receptors. One or two type II fibers innervate the periphery of the sensory central region of each nuclear chain intrafusal fiber to one or both sides (respectively) of the middle portion that is instead innervated by a
type Ia sensory fiber. Type II fibers typically branch out upon the nuclear chain fiber, but may sometimes instead coil around it like the type Ia fibers; type II fibers are said to form secondary afferent endings, whereas type Ia fibers form primary endings. == Touch receptors ==