The External Plantar Nerve, one of the two terminal branches of the posterior tibial nerve, arises beneath the internal annular ligament, and passes outwards with the external plantar artery between flexor brevis digitorum and accessorius.

Branches

Muscular to all the muscles in the sole of the foot except those supplied by the internal plantar nerve; the inter-ossei, and three lumbricals on the outer side. Articular to the tarsal and metatarsal joints. Cutaneous to the skin of the outer half of the sole of the foot and the one and a half toes on the lateral side.

The Pudendal Plexus is formed by branches from the anterior division of the first three sacral nerves, of the fourth and fifth sacral nerves, and the coccygeal nerves. It is formed on the back wall of the pelvis, and is distributed to the perineum {mainly by the pudic nerve) except for a few visceral branches.

Branches

From the plexus :

Muscular to levator ani, coccygeus, and external sphincter.

Cutaneous to the lower part of the buttock by means of a branch called the perforating cutaneous nerve.

The Pudic nerve arises from the second, third, and fourth sacral nerves; it passes through the sacro-sciatic foramen, and lies on the spine of the ischium on the inner side of the internal pudic artery. It then enters the perineum with the artery through the small sacro-sciatic foramen. The nerve supplies all the muscles and skin of the perineum.