Type II sensory fiber (group Aβ) is a type of sensory fiber, the second of the two main groups of stretch receptors. They are non-adapting, meaning that they keep responding even when the muscle has stopped changing its length.
Their firing rate is directly related to the muscle's instantaneous length, or position. This information would indicate the position of one's leg once it has stopped moving.
Type II fibers connect to nuclear chain fibers, but not to nuclear bag fibers. These connections are also called "flower spray endings".
|Histology: nervous tissue|
|Neurons (gray matter)||soma - axon (axon hillock, axoplasm, axolemma, neurofibril/neurofilament)
dendrite (Nissl body, dendritic spine, apical dendrite, basal dendrite)
types: bipolar - pseudounipolar - multipolar - pyramidal - Purkinje - granule
|Afferent nerve/Sensory nerve/Sensory neuron||GSA - GVA - SSA - SVA - fibers (Ia, Ib or Golgi, II or Aβ, III or Aδ or fast pain, IV or C or slow pain)|
|Efferent nerve/Motor nerve/Motor neuron||GSE - GVE - SVE - Upper motor neuron - Lower motor neuron (α motorneuron, γ motorneuron)|
|Synapses||neuropil - synaptic vesicle - neuromuscular junction - electrical synapse - Interneuron (Renshaw)|
|Sensory receptors||Meissner's corpuscle - Merkel nerve ending - Pacinian corpuscle - Ruffini ending - Muscle spindle
Free nerve ending
Olfactory receptor neuron - Photoreceptor cell - Hair cell - Taste bud
|Glial cells||Astrocyte (Radial glia) - Oligodendrocyte - Ependymal cells (Tanycytes) - Microglia|
|Myelination (white matter)||CNS: Oligodendrocyte|
PNS: Schwann cell - Neurolemma - Nodes of Ranvier/Internode - Schmidt-Lanterman incisures
|Related connective tissues||epineurium - perineurium - endoneurium - nerve fascicle - meninges|