Sacral spinal nerve 1: Information from Answers.com

The sacral spinal nerve 1 (S1) is a spinal nerve of the sacral segment.^[1].

It originates from the spinal column from below the 1st body of the sacrum

Sacrum, showing bodies in center.

Muscles

S1 supplies many muscles, either directly or through nerves originating from S1. They are not innervated with S1 as single origin, but partly by S1 and partly by other spinal nerves. The muscles are:

References

^ American Medical Association Nervous System -- Groups of Nerves

v • d • e Nerves: spinal nerves

Cervical (8)	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 (12)	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 (5)	L1, L2, L3, L4, L5 anterior (Lumbar plexus, Lumbosacral trunk) · posterior (Posterior branches of the lumbar nerves, Superior cluneal L1-L3)

Sacral (5)	S1, S2, S3, S4, S5 anterior (Sacral plexus) · posterior (Posterior branches of sacral nerves, Medial cluneal nerves)

Coccygeal (1)	anterior (Coccygeal plexus) · posterior (Posterior branch of coccygeal nerve)

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