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Great Saphenous Vein. This vein is a conjunction of the dorsal vein of the great toe and the dorsal venous arch of the foot. It travels up the leg, in front of the inner ankle protruberance (anterior to the medial malleolus), and ascends all the way up the lower limb on the inner aspect leg and thigh (anteromedial aspect).
The Nervus Ischiadicus. The large leg nerve (nervus ischiadus - also called the sciatic nerve), is the longest nerve in the human body. This nerve runs from the bottom of your back, along the buttock and back side of the leg, and branches out to the bottom of the foot. And nerve pain (neuralgia) in that part of the body is called sciatica. So sciatica is a name for the symptoms. The word doesn't say anything about the cause of the pain.