General somatic efferent fibers
|General somatic efferent fibers|
|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.
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 As such, some of the information contained herein may be outdated.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.
- Mehta, Samir et al. Step-Up: A High-Yield, Systems-Based Review for the USMLE Step 1. Baltimore, MD: LWW, 2003.