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
Tensor tympani is supplied by 
Select and explain. 
A. Maxillary branch of 5th nerve, B. Mandibular branch of 5th nerve, C. Facial nerve, D. Lingual nerve
B: Mandibular branch of 5th nerve
Answer: B: Mandibular branch of 5th nerve 
Explanation: The tensor tympani lies in a bony canal that opens at its lateral end on the anterior wall of the middle ear, and its medial end on the base of skull. Nerve supply: MANDIBULAR NERVE The fibres pass through the nerve to the medial pterygoid, and through the otic ganglion, without any relay. Development: From the mesoderm of first branchial arch Action: Tensing the tympanic membrane Ref:BDC 6th edition pg 281 (vol 3)