This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy 3, Subject name: Anatomy
Pretrematic nerve of 1st pharyngeal arch is 
Select and explain. 
A. Vagus nerve, B. Glossopharyngeal, C. Chorda tympani, D. Trigeminal
C: Chorda tympani
Answer: C: Chorda tympani 
Explanation: Pharyngeal Arch Nerves: Nerve of 1st arch - Mandibular division of trigeminal nerve Pretrematic nerve - Chorda tympani & greater petrosal nerves (purely sensory) of facial nerve. Nerve of 2nd arch - Facial nerve Pretrematic nerve - Tympanic branch of glossopharyngeal nerve. Nerve of 3rd arch - Glossopharyngeal nerve Pretrematic nerve - auricular branch of vagus nerve Nerve of 4th arch - Pharyngeal branch of vagus nerve Nerve of 6th arch - Recurrent laryngeal branch of vagus nerve.