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sacral spinal nerve 3
The sacral spinal nerve 3 (S3) is a spinal nerve of the sacral segment.〔(American Medical Association ) Nervous System -- Groups of Nerves〕
It originates from the spinal column from below the 3rd body of the sacrum
==Muscles==
S3 supplies many muscles, either directly or through nerves originating from S3. They are not innervated with S3 as single origin, but partly by S3 and partly by other spinal nerves. The muscles are:
* iliococcygeus
* puborectalis
* coccygeus
* sphincter urethrae membranaceae
* superior gemellus
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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