Semitendinous

Semitendinosus is a muscle located in the posterior compartment of the thigh. It is one of the three hamstring muscles, along with the biceps femoris and semitendinosus. The semitendinosus muscle is so named because it has a long tendon of insertion. It originates from the ischial tuberosity and inserts on the medial surface of the tibia.

Anatomy

The semitendinosus muscle is located in the posterior compartment of the thigh, originating from the ischial tuberosity. It runs down the back of the thigh and inserts on the medial surface of the tibia. The muscle is fusiform in shape and has a long tendon of insertion, which gives it its name.

Function

The semitendinosus muscle is involved in flexion of the knee and extension of the hip joint. It also helps to medially rotate the tibia on the femur when the knee is flexed and medially rotate the femur when the hip is extended.

Clinical significance

Injury to the semitendinosus muscle or its tendon can result in a hamstring strain, which is a common injury in sports that involve running or jumping. Treatment typically involves rest, ice, compression, and elevation (RICE), along with physical therapy to restore strength and flexibility.

See also

• Hamstring
• Biceps femoris
• Semitendinosus

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