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
Preganglionic fibres to the submandibular ganglion arise from? 
Select and explain. 
A. Superior salivatory nucleus, B. Inferior salivatory nucleus, C. Nucleus of tractus solitaries, D. Nucleus ambiguous
A: Superior salivatory nucleus
Answer: A: Superior salivatory nucleus 
Explanation: Sensory root is from the lingual nerve. It is suspended by two roots of lingual nerve Sympathetic root is from the sympathetic plexus around the facial aery. This plexus contains postganglionic fibres from the superior cervical ganglion of sympathetic trunk. These fibres pass express through the ganglion and are vasomotor to the submandibular gland Secretomotor root is from superior salivatory nucleus through nervus intermedius chorda tympani which is abranch of cranial nerve VII. Chorda tympani joins lingual nerve.The parasympathetic fibres get relayed in the submandibular ganglion Ref BDC volume 3,sixth edition pg 310