(From cms, a leg). The nerve which passes from the loin into the thigh is thus called. The second lumbar nerve joins the third, and that again communicating with the fourth, they produce this crural nerve (see Lumbares,) which passing under Poupart's ligament, runs on the fore part of the thigh, under the iliacus interims muscle; it disperses itself into many branches, one of the principal of which accompanies the vena saphena all the way to the ancle.

Crlralis vena, (from the same). Called also ischias. The external iliac vein, going out from under the liga-mentum Fallopii, on the inside of the iliac artery, is there called crural. About an inch below its passing out of the abdomen, it sends off a large branch, called the saphena; after which it sinks between the muscles, and is distributed to all the inner parts of the lower extremity, accompanying the crural artery to the toes. In its descent down the thigh, it runs behind the crural artery: when it hath arrived into the lower part of the thigh, its situation is between the crural artery and the inner condyle of the os femoris; and just above the ham it takes the name of poplitea.