Special_somatic

Special somatic afferent

Special somatic afferent (SSA) refers to afferent nerves of the special senses. Examples of nerves containing SSA fibers include the optic nerve and the vestibulocochlear nerve.^[1]

References

^ Mehta, Samir et al. Step-Up: A High-Yield, Systems-Based Review for the USMLE Step 1. Baltimore, MD: LWW, 2003.

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v • d • e 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