Anatomy · Pelvis, Perineum and Reproductive Anatomy

Which structure forms the medial wall of the ischioanal fossa?

A Obturator internus muscle
B Levator ani muscle ✓
C Gluteus maximus muscle
D Piriformis muscle

Correct answer: B. Levator ani muscle

Explanation

The levator ani muscle and the anal canal form the medial wall of the ischioanal fossa. The obturator internus muscle forms the lateral wall. The gluteus maximus forms the posterior wall. The piriformis is too superior and does not bound the ischioanal fossa.

Reference: Gray's Anatomy, 41st ed.

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