Sacral spinal nerve 4
Sacral spinal nerve | |
---|---|
Details | |
Identifiers | |
Latin | Nervi spinalis |
FMA | 6426 |
Anatomical terminology |
The sacral spinal nerve 4 (S4) is a
sacral segment.[1]
It originates from the
spinal column from below the 4th body of the 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
- puborectalis
- coccygeus
- Sphincter ani externus muscle
- sphincter urethrae membranaceae
Additional Images
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Sacral spinal nerve 4
References
- ^ American Medical Association Nervous System -- Groups of Nerves