This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
All of the following are true about the middle ear activity except 
Select and explain. 
A. Roof is formed by tegmen tympani, B. Anterior wall has opening of two canals, C. Medial wall is formed by tympanic membrane, D. Floor has bulb of internal jugular vein
C: Medial wall is formed by tympanic membrane
Answer: C: Medial wall is formed by tympanic membrane 
Explanation: RELATIONS OF MIDDLE EAR: ROOF-Tegmen tympani FLOOR-Internal jugular vein ANTERIOR WALL-Internal carotid aery, canal for tensor tympani, tubal opening POSTERIOR WALL-Facial canal, aditus to antrum, MEDIAL WALL-Tympanic plexus, promontory, oval window, round window, pyramid LATERAL WALL-Tympanic membrane,chorda tympani nerve, incus, malleus Ref BDC volume 3,sixth edition