Which muscle flexes both the thigh and the leg?

The Sartorius muscle is responsible for flexing both the thigh and the leg. This long, thin muscle runs down the length of the thigh from the hip to the knee. It is unique because it crosses both the hip and knee joints, allowing it to facilitate movements in both areas. When the Sartorius contracts, it helps in flexing the hip by bringing the thigh towards the abdomen while simultaneously bending the knee, effectively flexing the leg.

The Rectus Femoris is the only muscle in the quadriceps group that also crosses the hip joint and assists with hip flexion, but its primary action is to extend the leg at the knee joint. The Masseter is a muscle involved in chewing, primarily responsible for jaw movement rather than impacting the thigh or leg. The Intercostals are muscles located between the ribs that assist with breathing, and they do not play a role in flexing the thigh or leg. Understanding the specific actions and anatomical locations of these muscles is crucial for recognizing their functions in the body.