This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Middle Ear, Subject name: ENT
Which of the following is true about Facial recess? 
Select and explain. 
A. Medial to veical pa of facial nerve, B. Lateral to horizontal pa of facial nerve, C. Medial to horizontal pa of facial nerve, D. Lateral to veical pa of facial nerve
D: Lateral to veical pa of facial nerve
Answer: D: Lateral to veical pa of facial nerve 
Explanation: O Facial recess or posterior sinus is a depression in posterior wall lateral to pyramid. O It is bounded medially by the veical pa of Facial nerve, inferiorly by the chorda- facial angle and superiorly by fossa incudis. O Surgically, facial recess is impoant, as direct access can be made through this into the middle ear without disturbing posterior canal wall (Posterior Tympanotomy)