Semitendinous
Semitendinosus
The Semitendinosus (/ˌsɛmɪˌtɛndɪˈnoʊsəs/) is a long superficial muscle in the back of the thigh. It is so named because it has a long tendon of insertion.
Etymology
The term "Semitendinosus" is derived from the Latin words "semi," meaning half, and "tendinosus," meaning relating to a tendon. This is due to the muscle's long, tendinous nature.
Anatomy
The Semitendinosus, remarkably long and slender, is situated at the posterior and medial aspect of the thigh. It arises from the lower and medial impression on the upper part of the tibia, and from the lower part of the sacrotuberous ligament.
Function
The Semitendinosus muscle is one of three hamstring muscles that are located at the back of the thigh. The other two are the biceps femoris and the semimembranosus. The Semitendinosus muscle helps to flex the knee and extend the hip. 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.
Related Terms
- Hamstring: A group of three muscles in the back of the thigh that affect hip and knee movement.
- Biceps Femoris: One of the three hamstring muscles, located in the back of the thigh.
- Semimembranosus: Another one of the three hamstring muscles, also located in the back of the thigh.
- Tibia: The shinbone, a large bone in the lower leg.
- Sacrotuberous ligament: A broad and strong ligament situated at the lower part of the posterior sacrum to the tuberosity of the ischium.
External links
- Medical encyclopedia article on Semitendinous
- Wikipedia's article - Semitendinous
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