Semitendinosus: A Broad Muscle of the Hamstring Group
The semitendinosus is one of the three muscles that make up the hamstring group. Known for its length and breadth, this muscle is situated closer to the inner side of the thigh compared to the other hamstrings. It originates from the inner region of the ischial tuberosity and attaches to the upper part of the tibia as well as the deep fascia of the leg. While its primary function is to extend the hip joint, the semitendinosus also plays a role in inward or medial rotation of the thigh.
Semimembranosus Muscle: Anatomy and Function
The semimembranosus muscle, along with the semitendinosus muscle, shares several similarities in terms of anatomy and function. However, the semimembranosus muscle has some distinct characteristics. It is a broad muscle that is wider and flatter compared to the semitendinosus muscle. It originates from a higher portion of the ischial tuberosity and attaches to the tibial condyle.
Similar to the semitendinosus muscle, the semimembranosus muscle plays a role in the medial rotation of the hip. Additionally, it is partially responsible for the medial rotation of the knee. This muscle also aids in counteracting forward bending at the knee joint.