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: ENT
Endolymphatic duct connects which structure? 
Select and explain. 
A. Scala media to subdural space, B. Scala vestibule to aqueduct of cochlea, C. Scala tympani to aqueduct of cochlea, D. Scala tympani to subdural space
A: Scala media to subdural space
Answer: A: Scala media to subdural space 
Explanation: Endolymphatic duct - It is a pa of membranous labyrinth (Scala media)It is formed by union of saccule and utricleIt connects scala media to subdural spaceIts terminal pa is dilated to form the endolymphatic sacEndolymphatic sac lies between the two layers of dura on the posterior surface of petrous boneSurgical impoance - Endolymphatic sac is exposed for drainage or shunt operation in Meniere's disease