The common criteria of any hamstring muscles are:
- Muscles should originate from
- Muscles should be inserted over the knee joint, in the
tibia or in the
- Muscles will be innervated by the
tibial branch of the sciatic nerve.
- Muscle will participate in flexion of the
knee joint and extension of the
Those muscle which fulfills all of the four criteria are called true hamstrings.
adductor magnus reaches only up to the adductor tubercle of the femur, but it is included amongst the hamstrings because the tibial collateral ligament of the knee joint morphologically is the degenerated tendon of this muscle. The ligament is attached to medial
epicondyle, two millimeters from the adductor tubercle.