This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
In a case of fracture of middle cranial fossa, lesion of which of the following structure result in absence of tears? 
Select and explain. 
A. Ciliary ganglion, B. Cervical ganglion, C. Trigeminal ganglion, D. Greater petrosal nerve
D: Greater petrosal nerve
Answer: D: Greater petrosal nerve 
Explanation: Greater petrosal nerve is a branch of facial nerve. It traverse through the petrous pa of temporal bone, middle cranial fossa, pterygoid canal and pterygopalatine fossa to ultimately supply secretory function to the lacrimal gland. So in case of fracture of middle cranial fossa, this nerve is damaged which in turn lead to absent innervation of lacrimal glands and absent tears.