General somatic efferent fibers

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General somatic efferent 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 somatic efferent neurons (GSE, 'somatomotor, or somatic motor fibers), arise from motor neuron cell bodies in the ventral horns of the gray matter within the spinal cord. They exit the spinal cord through the ventral roots, carrying motor impulses to skeletal muscle.

Of the somatic efferent neurons, there exist subtypes.

• Alpha motor neurons (α) target extrafusal muscle fibers.
• Gamma motor neurons (γ) target intrafusal muscle fibres.

Examples of nerves that contain GSE fibers include the oculomotor nerve, the trochlear nerve, the abducens nerve, and the hypoglossal nerve. ^[1]

See also

• Efferent 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 As such, some of the information contained herein may be outdated.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 .