|Sacral spinal nerve
|The plan of the lumbosacral plexus
The sacral spinal nerve 1 (S1) is a spinal nerve of the sacral segment.
It originates from the spinal column from below the 1st body of the sacrum
, showing bodies in center.
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: