Tubercle of the femur
Encyclopedia
The quadrate tubercle is a small tubercle found upon the upper part of the femur
Femur
The femur , or thigh bone, is the most proximal bone of the leg in tetrapod vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs. In vertebrates with four legs such as dogs and horses, the femur is found only in...

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It is the point of insertion of the quadratus femoris.
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