You are stretching your calves. Your upper extremities are out in front of you,

Question

You are stretching your calves. Your upper extremities are out in front of you, flexed at the shoulder, extended at the elbow and wrist, supporting your body against a wall. Your left lower extremity is flexed at the hip and knee. Your right lower extremity is extended at the hip and knee and dorsiflexed at the ankle. Based on this scenario answer the following questions:

4. Which of the following muscles would be antagonists to the muscles acting on the right hip?

A. Iliacus, rectus femoris, psoas major

B. Gluteus maximus, adductor magnus, biceps femoris

C. Biceps femoris, Rectus Femoris, Gluteus medius

D. Adductor Magnus, Semitendinosus, Semimembraneosus

5. What would be the nerve innervation to the muscles acting on the right knee?

A. Sciatic n.

B. Obturator n.

C. Tibial n.

D. Femoral n.

Explanation / Answer

Ans 1. Iliacus, rectus femoris, psoas major.

Iliacus and psoas major together are flexors of the hip joint called iliopsoas and rectus femoris is flexor of the thigh at the hip joint. Hence they are antagonists to the extensor muscles of hip.

Ans 2. Femoral nerve innervates the muscles of extension of the knee. i.e quadriceps.

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