Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The semimembranosus is one of the three muscles that make up the hamstring group located at the back of the thigh. It plays a crucial role in knee flexion and hip extension.
Related terms
Hamstring: A group of three muscles, including the semimembranosus, semitendinosus, and biceps femoris, located at the back of the thigh responsible for knee flexion and hip extension.
Knee Flexion: The act of bending the knee by decreasing the angle between the thigh and lower leg.
Hip Extension: The movement of increasing the angle between the front of the pelvis and thighs, moving the leg backward