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Sacral spinal nerve 4 : ウィキペディア英語版 | Sacral spinal nerve 4
The sacral spinal nerve 4 (S4) 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 4th body of the sacrum ==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 * puborectalis * coccygeus * Sphincter ani externus muscle * sphincter urethrae membranaceae
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Sacral spinal nerve 4」の詳細全文を読む
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