Sciatic nerve

It is the longest and widest single nerve in the human body, going from the top of the leg to the foot on the posterior aspect.

[2]: 422–4 [3][4] The sciatic nerve supplies sensation to the skin of the foot, as well as the entire lower leg (except for its inner side).

In particular:[2]: 422–4 Pain caused by compression or irritation of the sciatic nerve by a problem in the lower back is called sciatica.

[7][9] It is unclear if inversion therapy is able to decompress the sacral vertebrae; it may only work on the lumbar aspects of the sciatic nerves.

A sciatic nerve injury may also occur from improperly performed injections into the buttock, and may result in sensory loss.

According to Jewish law, the sciatic nerve (Hebrew: Gid hanasheh) may not be eaten by Jews to commemorate Jacob's injury in his struggle with an angel.

3D still showing Sciatica.
Tibial and common fibular nerve (aka common peroneal nerve)