In humans the thigh's the area between the pelvis and the knee. Anatomically, it's part of the lower limb. The single bone in the thigh's called the femur. This bone's very thick and strong (due to the high proportion of cortical bone), and forms a ball and socket joint at the hip, and a condylar joint at the knee. Fascial compartments In cross-section, the thigh's divided up into three fascial compartments. These compartments use the femur as an axis, and are separated by tough connective tiss… (More on Thigh)