coccygeal nerve

These are the coccygeal vertebrae, and there is one final pair of coccygeal nerves.

The coccygeal nerve is the 31st spinal nerve.

This plexus is formed by the fifth sacral nerve (with a contribution from S4) and the coccygeal nerve.

The pudendal (S2-S4) and coccygeal nerves (S5-Co2) supply the muscles of the pelvic floor and the surrounding skin.

The only nerve of the plexus is the coccygeal nerve, that serves sensory innervation of the skin in the coccygeal region.

However, adhering to the outer surface of the filum terminale are a few strands of nerve fibers which probably represent rudimentary second and third coccygeal nerves.

The most inferior of the spinal nerves, the coccygeal nerve leaves the spinal cord at the level of the conus medullaris, superior to the filum terminale.

The nerves divide in branches and the branches from different nerves join with one another, some of them join with lumbar or coccygeal nerves' branches too.

The coccygeal nerve, the last spinal nerve, emerges from the sacral hiatus, unites with the ventral rami of the two last sacral nerves, and forms the coccygeal plexus.

The anterior divisions of the lumbar nerves, sacral nerves, and coccygeal nerve form the lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic.

The posterior division of the coccygeal nerve does not divide into a medial and a lateral branch, but receives a communicating branch from the last sacral; it is distributed to the skin over the back of the coccyx.

The sensory and motor innervation to the lower limb is supplied by the lumbosacral plexus, which is formed by the ventral rami of the lumbar and sacral spinal nerves with additional contributions from the subcostal nerve (T12) and coccygeal nerve (Co1).