Lower Body Muscle Review

What is the primary action of the piriformis muscle?

• Hip internal rotation

• Hip external rotation

• Knee flexion

• Ankle dorsiflexion

Where does the piriformis muscle originate?

• Posterior surface of the sacrum

• Anterior surface of the sacrum

• Superior aspect of the greater trochanter

• Inferior aspect of the greater trochanter

Where is the insertion point of the piriformis muscle?

• Anterior surface of the sacrum

• Posterior surface of the sacrum

• Superior aspect of the greater trochanter

• Inferior aspect of the greater trochanter

Which nerve is associated with the piriformis muscle?

• Femoral nerve

• Sciatic nerve

• Sacral plexus L5, S1, S2

• Obturator nerve

What additional action does the piriformis muscle perform when the hip is flexed?

• Hip adduction

• Hip abduction

• Knee extension

• Ankle plantarflexion

What is the action of the Superior Gemellus muscle?

• Internal hip rotation

• External hip rotation

• Flexion of the hip

• Extension of the hip

Where does the Superior Gemellus muscle originate?

• Greater trochanter

• Sacral plexus

• Ischial spine

• Medial surface of the femur

Where is the insertion point of the Superior Gemellus muscle?

• Ischial spine

• Medial surface of greater trochanter

• Sacral plexus

• External obturator

Which nerve innervates the Superior Gemellus muscle?

• Femoral nerve

• Sciatic nerve

• Sacral plexus L(5), S1, 2

• Obturator nerve

What is the action of the Inferior Gemellus muscle?

• Internal hip rotation

• External hip rotation

• Flexion of the hip

• Extension of the hip