Type II sensory fibers orgroup II sensory fibers areafferent (sensory) nerve fibers tonically conveying information from slowly-adaptating receptors.[1]
Group Aαtype II sensory fiber tonically conveyproprioceptive information regarding static muscle stretch/length fromnuclear chainintrafusal fibers ofmuscle spindles which function asstretch 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 atype 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.[2]
Group Aβtype II sensory fibers areafferent (sensory) nerve fibers conveying information from slowly-adaptatingtouch receptions, notablyMerkel cell-neurite complexes (sense static touch), andRuffini endings (sense skin stretch and over-extension inside joints).[citation needed]
