Question

From the Sacculus arises a narrow tube known as
A) Ductus Endolymphaticus
B) Endolymphatic Sac
C) Cochlea
D) None of the above

Answer 1

Hint:The saccule is a thin membranous sac, together with the utricle, within the vestibule of the inner ear. It is part of the membranous labyrinth and plays an important role in orientation and balance, especially in vertical tilting.

Complete Answer:
Every human ear has three main sections: the outer ear, middle ear and inner ear. The inner ear is considered a labyrinth. It is made up of a group of intertwined canals and sacks. The membranous labyrinth is found within the bony labyrinth and is enclosed by a fluid known as perilymph. The endolymph is packed in the labyrinth of the membrane. The sensory receptors are found in the cochlea and the vestibular system preserves the equilibrium of the body.
The Vestibular apparatus retains its balance and is present above the cochlea. It is located in the labyrinth of the membrane. These have two sac-like chambers called saccule and utricle, and three semicircular canals.
Ductus endolymphatic duct is a narrow duct that emerges from the back wall of the saccule, which is located in the membranous labyrinth. This duct is connected by the utricular saccular duct. The role of the endolymphatic ductus is to control the flow of the endolymph to other regions. It is also assumed that the endolymphatic duct blocks bacteria from penetrating the inner ear.

The correct answer is option ‘A’, Ductus Endolymphaticus.

Note:The utricle is a thin membranous sac that is a part of the membranous labyrinth. It is combined with the saccule in the vestibule of the inner ear. It plays an important role in orientation and static equilibrium, especially in horizontal tilting.