Semimembranosus muscle (3D)

This tutorial explores the semimembranosus muscle, part of the hamstrings in the thigh's posterior compartment. It covers the muscle's innervation by the tibial nerve, its origin at the ischial tuberosity, and insertion at the medial tibial condyle. The video details the muscle's actions, including thigh extension at the hip joint and leg flexion and internal rotation at the knee joint. The semimembranosus works in conjunction with other hamstring muscles to facilitate these movements, acting as an antagonist to the quadriceps femoris. The tutorial concludes with a recap of these functions.

Which nerve is responsible for the innervation of the semimembranosus muscle?

• Femoral nerve

• Tibial nerve

• Obturator nerve

• Peroneal nerve

What is the primary action of the semimembranosus muscle at the hip joint?

• Extension of the thigh

• Abduction of the thigh

• Adduction of the thigh

• Flexion of the thigh

Which movement is facilitated by the semimembranosus muscle at the knee joint?

• Adduction of the leg

• Abduction of the leg

• Flexion of the leg

• Extension of the leg

When the knee is flexed at a 90-degree angle, what action does the semimembranosus muscle perform?

• Lateral rotation

• Internal rotation

• External rotation

• Medial rotation

Which of the following activities involves the flexion of the leg at the knee by the semimembranosus muscle?

• Sitting

• Jumping

• Walking

• Standing