Internal ear (dave's notes)

Question 1

Where is the internal ear found? What does it consist of?

Answer 1

Buried in the petrous bone, consisting of the osseous labyrinth containing the membranous labyrinth filled with endolymph.

Question 2

What fills the space between the osseous and membranous labyrinth?

Answer 2

Perilymph

Question 3

Name the parts of the osseous labyrinth from front to back

Answer 3

Cochlear canal
Vestibule
Semicircular canals

Question 4

What two labyrinths make up the inner ear?

Answer 4

The osseous and membranous labyrinths

Question 5

Name the parts of the membranous labyrinths

Answer 5

Cochlear duct (within the canal, concerned with hearing)
Utricle and saccule (within the vestibule; concerned with static balance)
Semicircular ducts (within the semicircular canal, concerned with kinetic balance)

Question 6

What is the nerve supply to the internal ear?

Answer 6

CN VIII Vestibulocochlear

Question 7

How does the cochlear nerve enter the inner ear?

Answer 7

Enters the front of the inferior part of the lamina cribrosa

Question 8

What supplies the macula of the saccule and ampulla of the semicircular duct?

Answer 8

The lower division of the vestibular nerve

Question 9

What does the upper division of the vestibular nerve supply?

Answer 9

The macula of the utricle and the ampullae of the anterior and lateral semicircular folds

Question 10

See text for more

Answer 10

ye-ha