Sacral spinal nerve 4

Sacral spinal nerve
Sacral spinal nerve
	The plan of the lumbosacral plexus
Details
Identifiers
Latin	Nervi spinalis
FMA	6426
	Anatomical terminology [edit on Wikidata]

The sacral spinal nerve 4 (S4) is a spinal nerve of the sacral segment.^[1]

It originates from the spinal column from below the 4th body of the sacrum

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[]

Sacral spinal nerve 4

References[]

^ American Medical Association Nervous System -- Groups of Nerves

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[1] American Medical Association Nervous System -- Groups of Nerves

[1]

v t Spinal nerves
Cervical	C1 C2 C3 C4 C5 C6 C7 C8 anterior Cervical plexus Brachial plexus posterior Posterior branches of cervical nerves Suboccipital – C1 Greater occipital – C2 Third occipital – C3
Thoracic	T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 anterior Intercostal Intercostobrachial – T2 Thoraco-abdominal nerves – T7–T11 Subcostal – T12 posterior Posterior branches of thoracic nerves
Lumbar	L1 L2 L3 L4 L5 anterior Lumbar plexus Lumbosacral trunk posterior Posterior branches of the lumbar nerves Superior cluneal L1–L3
Sacral	S1 S2 S3 S4 S5 anterior Sacral plexus posterior Posterior branches of sacral nerves Medial cluneal nerves
Coccygeal	anterior Coccygeal plexus posterior Posterior branch of coccygeal nerve