Gross Anatomy Dry Laboratory Lower Body Practice Test

The obturator externus is innervated by which nerve division?

Posterior division of obturator nerve Anterior division of obturator nerve Femoral nerve Sciatic nerve

Correct Answer:

Posterior division of obturator nerve

Explanation:

Obturator externus receives motor input from branches of the obturator nerve that pass to the muscle after the nerve splits in the pelvis. The posterior division of the obturator nerve is the branch that supplies this deep medial thigh muscle, whereas the anterior division goes to other medial thigh muscles like adductor longus, adductor brevis, and gracilis. The femoral nerve serves the anterior thigh muscles, not obturator externus, and the sciatic nerve covers the posterior thigh and leg, not this muscle. So, the innervation of obturator externus by the posterior division of the obturator nerve best fits the anatomical pattern.

Access more questions from this quiz

Continue to Gross Anatomy Dry Laboratory Lower Body Practice Test for more practice questions and the full quiz experience.

Access More Questions