Semitendinosus - Podcast Version TeachMeAnatomy 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The semitendinosus is a muscle within the posterior compartment of the thigh. It is situated on the medial aspect of the posterior thigh and superficial to the semimembranosus muscle. Attachments: Originates from the ischial tuberosity of the pelvis and attaches to the medial surface of the tibia. Actions: Flexion of the leg at the knee joint. Extension of thigh at the hip. Medially rotates the thigh at the hip joint and the leg at the knee joint. Innervation: Tibial part of the sciatic nerve. Blood Supply: Profunda femoris artery By TeachMeSeries Ltd (2026) Fig 1The muscles of the posterior thigh. By TeachMeSeries Ltd (2026) Fig 2Cross section of the thigh, showing the position of the major muscle groups. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Atlas Prosection of the anterior and medial thigh, demonstrating the attachment of the sartorius, gracilis and semitendinosus to the proximal tibia (the pes anserinus). Prosection of the anterior and medial thigh, demonstrating the attachment of the sartorius, gracilis and semitendinosus to the proximal tibia (the pes anserinus). You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Frequent questions What is the semitendinosus muscle? The semitendinosus is a muscle located in the posterior compartment of the thigh, specifically on its medial side and above the semimembranosus muscle. It plays a key role in leg and thigh movements. What are the attachments of the semitendinosus? The semitendinosus originates from the ischial tuberosity of the pelvis and attaches to the medial surface of the tibia. This positioning allows it to effectively contribute to various movements of the leg and thigh. What actions are performed by the semitendinosus? The semitendinosus facilitates flexion of the leg at the knee joint, extension of the thigh at the hip, and medial rotation of both the thigh and leg. These actions are essential for activities such as walking and running. Which nerve innervates the semitendinosus muscle? The semitendinosus is innervated by the tibial part of the sciatic nerve. This nerve supply is crucial for the muscle's function and movement coordination. What is the blood supply to the semitendinosus? The semitendinosus receives its blood supply from the profunda femoris artery. This vascularisation is important for maintaining muscle health and function. Rate This Article