Endolymphatic duct connects which structure?: (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
Answer is A. 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