The hamstrings are the main group of muscles that make the knee flex. There are also other muscles that aid flexion which also rotate the knee in the medial lateral directions.
Hamstrings (Green Bands)
Bicep Femoris (Above left)
There are two parts to this muscle, the long head and short head. The long head originates from the rear of the pelvis and the short head from the rear of the femur. They both then come together and attach to the lateral side of leg to the head of the tibia.
Semitendinosus and Semimembranosus (Below Left)
Both attach to the same point as the Bicep Femoris. The Semitendinosus is made of largely of a tendon that then runs to the medial tibial surface. The semimembranosus attaches to the tibial medial condyle.
Gracilis (White)
Attaches to the rear of the pelvis and runs posteriorly and attaches to the medial surface of the tibia.
Sartorius (White)
Attaches to the anterior side of the pevis then passes round the medial side of the femur and attaches to to the same area as the Gracilis and Semitendinosus.
Gastrocnemius (Blue)
Attaches to the ankle then passes up the posterior of the tibia and splits to attach to the medial and lateral side of the femur.
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