Muscle
Semitendinosus
Medial hamstring, long tendon
High-yield
Long tendon of the pes anserinus; flexes the knee and medially rotates the flexed leg. Tibial division.
Overview
A medial hamstring with a long cord-like distal tendon, inserting at the pes anserinus and often harvested for ACL grafts.
Reference facts
- Origin
- Ischial tuberosity
- Insertion
- Superomedial surface of the tibia (pes anserinus)
- Action
- Flexes the knee, medially rotates the flexed leg, and extends the hip
- Innervation
- Tibial division of the sciatic nerve (L5, S1, S2)
- Blood supply
- Perforating branches of the deep femoral artery
Frequently asked questions
What does the semitendinosus do?
The semitendinosus flexes the knee, medially rotates the flexed leg, and extends the hip.
What nerve innervates the semitendinosus?
The semitendinosus is innervated by the tibial division of the sciatic nerve (L5, S1, S2).
Where does the semitendinosus attach?
The semitendinosus originates from the ischial tuberosity and inserts on the superomedial surface of the tibia (pes anserinus).
What is the blood supply of the semitendinosus?
The semitendinosus is supplied by the perforating branches of the deep femoral artery.