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 vestibuli 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 part of membranous labyrinth (Scala media)

It is formed by union of saccule and utricle
It connects scala media to subdural space
Its terminal part is dilated to form the endolymphatic sac
Endolymphatic sac lies between the two layers of dura on the posterior surface of petrous bone
Surgical importance – Endolymphatic sac is exposed for drainage or shunt operation in Meniere’s disease

ALSO KNOW

Ductus reuniens – connects cochlear duct to saccule
Aqueduct of cochlea – connects scala tympani to subarachnoid space