Special somatic afferent

Special somatic afferent (SSA) refers to afferent nerves that carry information from the special senses of vision, hearing and balance. The cranial nerves containing SSA fibers are the optic nerve (II) and the vestibulocochlear nerve (VIII). "SSA" may also stand for "special sensory afferent", but this term encompasses both special somatic and special visceral afferents.^[1]

References

↑ Drake et al. (2010), Gray's Anatomy for Students, 2nd Ed., Churchill Livingstone.

Tissue Types

Cell Types

insulating:	Myelination: Oligodendrocyte

other	Astrocyte Radial glial cell Ependymal cells Tanycyte Microglia

General	Posterior Root Ganglion Ramus Anterior Root Ramus Ramus communicans Gray White Autonomic ganglion (Preganglionic nerve fibers Postganglionic nerve fibers)

Connective tissues	epineurium perineurium endoneurium nerve fascicle

Neuroglia	Myelination: Schwann cell Neurolemma Myelin incisure Node of Ranvier Internodal segment Satellite glial cell

Parts

Soma	Axon hillock

Axon	Axon terminals Axoplasm Axolemma Neurofibril/neurofilament

Dendrite	Nissl body Dendritic spine Apical dendrite/Basal dendrite

Types

Termination

Synapse	Electrical synapse/Gap junction Chemical synapse Synaptic vesicle Active zone Postsynaptic density Autapse Ribbon synapse Neuromuscular junction

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

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