Q 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
Explanation
Correct Answer :A. Scala media to subdural space
Ref. Dhingra 6/e, p9, 5/e, p 12
Endolymphatic duct – It is a part of membranous labyrinth (Scala media)
y It is formed by union of saccule and utricle
y It connects scala media to subdural space
y Its terminal part is dilated to form the endolymphatic sac
y Endolymphatic sac lies between the two layers of dura on the posterior surface of petrous bone
y Surgical importance – Endolymphatic sac is exposed for drainage or shunt operation in Meniere’s disease
ALSO KNOW
y Ductus reuniens – connects cochlear duct to saccule
y Aqueduct of cochlea – connects scala tympani to subarachnoid space
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 Explanation
Correct Answer :A. Scala media to subdural space
Ref. Dhingra 6/e, p9, 5/e, p 12
Endolymphatic duct – It is a part of membranous labyrinth (Scala media)
y It is formed by union of saccule and utricle
y It connects scala media to subdural space
y Its terminal part is dilated to form the endolymphatic sac
y Endolymphatic sac lies between the two layers of dura on the posterior surface of petrous bone
y Surgical importance – Endolymphatic sac is exposed for drainage or shunt operation in Meniere’s disease
ALSO KNOW
y Ductus reuniens – connects cochlear duct to saccule
y Aqueduct of cochlea – connects scala tympani to subarachnoid space