Inner Ear Structure

Question 1

What is the Inner Ear?

Answer 1

Bony labyrinth which contains twisting channels which work their way through the temporal bone (petrous region).
Bony labyrinth contains a matching membranous labyrinth.

Question 2

The Inner Ear bony labyrinth is filled with what?

Answer 2

Perilymph

Question 3

The membranous labyrinth is filled with what?

Answer 3

Endolymph

Question 4

The inner ear contains what 3 sections?

Answer 4

1. Vestibule
2. Semicircular canals
3. Cochlea

Question 5

What is the Vestibule?

Answer 5

The central egg-shaped cavity in the bony labyrinth.

Question 6

Suspended in the perilymph of the Vestibule are what 2 sacs?

Answer 6

1. Utricle - extending to the semicircular canals.

2. Saccule - extends to the cochlea.

Question 7

What do both the Utricle & Saccule have as an equilibrium receptor?

Answer 7

Maculae

Question 8

What doe the Maculae do?

Answer 8

Responds to gravity & changes in the position of the head.

**STATIC Equilibrium - make adjustments to keep balanced in a new position.

Question 9

How is sensory information is transmitted to the brain?

Answer 9

The Vestibular branch of CN VIII (Vestibulocochlear)