Obturator internus muscle (3D)

The video tutorial explores the obturator internus muscle, detailing its anatomy, origin, insertion, and functions. It highlights the muscle's role in external rotation and abduction of the thigh at the hip joint, as well as its contribution to hip joint stability. The tutorial also discusses the nerve innervation of the obturator internus and its importance in walking and other movements.

What is the primary function of the obturator internus muscle?

• Flexion of the thigh

• External rotation of the thigh

• Extension of the knee

• Internal rotation of the thigh

Which nerve innervates the obturator internus muscle?

• Femoral nerve

• Sciatic nerve

• Nerve to obturator internus

• Obturator nerve

During which phase of walking does the obturator internus assist in external rotation?

• Stance phase

• Swing phase

• Heel strike

• Toe-off

What movement does the obturator internus facilitate when the thigh is flexed?

• Flexion

• Abduction

• Adduction

• Extension

How does the obturator internus contribute to hip joint stability?

• By extending the knee

• By keeping the head of the femur within the acetabulum

• By rotating the pelvis

• By flexing the hip