Unit VIII - Ear Pt. 2 Flashcards Preview

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Flashcards in Unit VIII - Ear Pt. 2 Deck (70)
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1

What SURROUNDS the membranous labyrinth?

Perilymph within the bony labyrinth

2

What is another name for the inner ear?

Labyrinth

3

What are the parts of the bony labyrinth?

Cochlea, vestibule, semicircular canals

4

What is the shape of the cochlea, and what does it contain?

Snail shell shaped; contains cochlear duct

5

What is contained in the vestibule?

Utricle and saccule

6

What do the lateral, anterior, and posterior semicircular canals contain?

Semicircular ducts

7

What fluid is located WITHIN the membranous labyrinth?

Endolymph

8

The utricosaccular duct is located between what two structures?

Utricle and saccule

9

What structures are found in the vestibular labyrinth?

Utricle, saccule, semicircular ducts, utricosaccular duct, endolymphatic duct and sac, ductus reuniens

10

What is the cone-shaped central bony structure that the cochlea wraps around 2.5 to 2.75 times?

Modiolus

11

What is the name of the apex of the cochlea?

Cochlear cupula

12

The cochlear cupula lies in what direction?

Anterolaterally

13

What is the bony ridge that connects the cochlea to the modiolus?

Lamina of the modiolus

14

What three channels make up the cochlea?

Cochlear duct, scala vestibuli, scala tympani

15

Where does the cochlear duct end?

Apex of cochlea

16

How do the scala vestibuli and scala tympani communicate?

At the apex through a channel called the helicotrema

17

What fluid fills the scala vestibuli?

Perilymph

18

As the stapes vibrates, where are the vibrations transmitted?

Into the scala vestibuli

19

Which structure is located above the cochlear duct: scala vestibuli or scala tympani?

Scala vestibuli

20

Which structure is located below the cochlear duct: scala vestibuli or scala tympani?

Scala tympani

21

How do vibrations that are transmitted through the scala vestibuli pass to the scala typani?

Via the helicotrema

22

What is the base of the scala tympani?

Round window

23

What forms the base of the scala vestibuli?

Oval window

24

Where is the cochlear duct located and what is found above and below it?

Middle of the bony labyrinth with scala vestibuli above and scala tympani below

25

What fills the cochlear duct?

Endolymph

26

The cochlear duct is attached to what structure?

Lamina of the modiolus

27

What anchors the cochlear duct to the outer wall of the cochlea?

Spiral ligament

28

What separates the cochlear duct from the scala vestibuli?

Vestibular membrane

29

What separates the cochlear duct from the scala tympani?

Basilar/spiral membrane

30

Where is the spiral organ located, and what is it attached to?

On the floor of the cochlear duct; attached to basilar/spiral membrane