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The hamstring muscle group consists of three muscles of the posterior region of the thigh:
the biceps femoris muscle (long head)
the semitendinosus muscle
the semimembranosus muscle.
They are mainly flexors and secondarily leg extensors of the thigh. When walking or running, they are also antagonists quadriceps, slowing the advance of the leg at the end of the step and preventing the brutal and full knee extension.
They fit up on the ischial tuberosity and down on the tibia (Bridle) and the head of the fibula (fibula).
The long head of the biceps femoris and semitendinosus have a common tendon on the posteromedial part of the ischial tuberosity.
The semimembranous has isolated a large tendon that inserts into the ischial tuberosity outside the common tendon and the long head of biceps tendon semi.
Behind this muscle group travels the sciatic nerve.
At the top is the femur, the thigh bone. Downstairs there is the tibia, the leg bones. The bottom of the femur is rather round and the top of the tibia appears much flatter. The menisci are small blocks located between the two knee bones.
Lateral collateral ligament (LCL)
Ligament of the outer side of the knee
Short ligament, and tubular end
It is stretched between the femur top
and the fibular head down
It allows external stabilization of the knee