HAMSTRING MUSCLES
Hamstring muscles extend the hip joint and flex the knee joint.
A hamstring muscle:
Arises from the ischial tuberosity.
Is inserted into the tibia
Crosses both hip and knee joints.
Is supplied by the tibial division of the sciatic nerve.

The short head of the biceps femoris is not a hamstring because it does not arise from the ischial tuberosity and is not innervated by the tibial division of the sciatic nerve. Neither is the part of the adductor magnus that arises from the ischial tuberosity, even though it is innervated by the tibial division of the sciatic nerve, because it inserts on the femur rather than on one of the bones of the leg.

Hamstring muscles include the long head of biceps femoris, semitendinosus, and semimembranosus.
Content Courtesy : cats.med.uvm.edu
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