The ventral rami of the coccygeal nerves pass forward below the rudimentary transverse processes of the coccygeal vertebrae to join with the ventral rami of S4 and S5 to form the coccygeal plexus.  This small plexus lies anterior to the coccyx and receives grey rami communicantes from adjacent sympathetic ganglia.

The coccygeal plexus gives rise to the anococcygeal nerves, which pierce the sacrotuberous ligaments to supply adjacent areas of skin.

Supply
The coccygeal plexus supplies the coccygeus and levator ani muscles, as well as the skin overlying the coccyx.