The dorsal branches of Sacral spinal nerves are small, gain exit through the dorsal sacral foramina and supply the muscles and skin of the croup.
The ventral branches of the first and second enter into the formation of the lumbo-sacral plexus.
The third generally gives off a branch to the plexus and the rest unites with the fourth and divides into pudic and posterior haemorrhoidal nerves.
The pudic nerve passes on the sacrosciatic ligament, gives off branches to the bladder, urethra and muscular branches to the muscles of the anus.
At the ischial arch it supplies branches to ischiocavernosus, urethra, and corpus cavernosum penis in the male and vulva in the female and terminate in the clitoris.
The pudic nerve in the male is continued around the ischial arch, descends on the dorsum penis to reach the glans penis. It supplies the erectile tissue and prepuce.
The posterior haemorrhoidal nerve supplies the rectum.
The ventral primary branch of the fifth is small and supplies the muscles of the anus and skin, compressor coccygeus and skin of the tail.
