View source for Sacral spinal nerve 4

{{Infobox anatomy
| Name        = Sacral spinal nerve
| Latin       = nervi spinalis
| Image       = Sobo 1909 715.png
| Caption     = The plan of the lumbosacral plexus
| System      =
| Precursor   =
}}
The '''sacral spinal nerve 4''' (S4) is a [[spinal nerve]] of the [[sacral segment]].<ref>[http://www.ama-assn.org/ama/pub/category/7173.html American Medical Association] Nervous System -- Groups of Nerves</ref>

It originates from the [[spinal column]] from below the 4th body of the [[sacrum]] [[File:Gray95.png|thumb|right|300px|[[Sacrum]], showing bodies in center.]]

==Muscles==
S4 supplies many muscles, either directly or through nerves originating from S4. They are not innervated with S4 as single origin, but partly by S4 and partly by other spinal nerves. The muscles are:
* [[iliococcygeus muscle|iliococcygeus]]
* [[Puborectalis muscle|puborectalis]]
* [[Coccygeus muscle|coccygeus]]
* [[sphincter ani externus muscle]]
* [[Sphincter urethrae|sphincter urethrae membranaceae]]

==Additional images==

<gallery>
File:Slide21y.JPG|Sacral spinal nerve 4
</gallery>

==References==
{{reflist}}

{{Spinal nerves}}

[[Category:Spinal nerves]]


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