Hamstrings muscles

The hamstring muscles are a group of three muscles of the posterior compartment of thigh that play a crucial role in hip extension and knee flexion. These muscles include:

1. Biceps femoris: This muscle has two heads - the long head and the short head. The long head originates from the ischial tuberosity, while the short head originates from the femur. Both heads insert on the head of the fibula.

2. Semitendinosus: This muscle originates from the ischial tuberosity and inserts on the medial surface of the tibia.

3. Semimembranosus: This muscle also originates from the ischial tuberosity and inserts on the medial condyle of the tibia.

These muscles are biarticular, meaning they cross both the hip and knee joints, allowing them to extend the hip and flex the knee.