A muscle in the quadriceps, the rectus femoris muscle is attached to the hip and helps to extend or raise the knee. This muscle is also used to flex the thigh. The rectus femoris is the only muscle ...

Proceedings of the Royal Society of London. Series B, Biological Sciences, Vol. 154, No. 956 (Jul. 25, 1961), pp. 377-397 (21 pages) A tandem spindle is defined as one in which several encapsulated ...