General somatic afferent fibers

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General somatic afferent fibers
Image:Gray799.svg
Scheme showing structure of a typical spinal nerve. 1. Somatic efferent. 2. Somatic afferent. 3,4,5. Sympathetic efferent. 6,7. Sympathetic afferent.
Gray's	subject #190 849

The general somatic afferent fibers (GSA, or somatic sensory fibers), afferent fibers, arise from cells in the spinal ganglia and are found in all the spinal nerves, except occasionally the first cervical, and conduct impulses of pain, touch and temperature from the surface of the body through the posterior roots to the spinal cord and impulses of muscle sense, tendon sense and joint sense from the deeper structures.

Examples of nerves containing GSA fibers include the trigeminal nerve, the facial nerve, the glossopharyngeal nerve, and the vagus nerve. ^[1]

See also

• Afferent nerve

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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

References

Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .