| As the name implies,
the "biceps femoris" has two heads, or immovable ends,
one attached to the ischium (bone in the pelvis) and the other
attached to the femur (thigh bone). The muscle passes along the
back of the thigh on the lateral side and connects close to the
midline ends of the fibula and tibia (bones in the lower leg). The
biceps femoris is one of the hamstring muscles, and its tendon
(hamstring) can be felt as a ridge behind the knee. This muscle
functions to flex and rotate the leg laterally and to extend the
thigh. The "semitendinosus" is another of the hamstring
muscles. It is a long, bandlike muscle on the back of the thigh
toward the inside, connecting the ischium to the proximal end of
the tibia. It is so named because it becomes tendinous in the
middle of the thigh, continuing to its movable end as a long,
cordlike tendon. It functions to flex and rotate the leg medially
and to extend the thigh. The "semimembranosus" is the
third hamstring muscle and is the most inner-located muscle in the
back of the thigh. It connects the ischium to the tibia and
functions to flex and rotate the leg medially and to extend the
thigh.
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