Exam IV-Auditory Flashcards Preview

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Flashcards in Exam IV-Auditory Deck (27):
1

What type of fluid FILLS the membraneous labyrinth? What type of fluid is between the bony and membranous labyrinth?

Endolymph fillls, perilymph between

2

How many turns for the Cochlea?

2.5

3

What is the point where the Scala Tympani and the Scala Vestibuli meet?

HelicoTrema

4

Which Scala is Superior? Which is Inferior?

SUPERIOR=Scala Vestibuli INFERIOR=Scala Tympani

5

Which structure houses the endolymph?

The Scala Media

6

Which structure contains the perilymph?

Both the Scala Vestibuli and the Scala Tympani

7

Where are the hair cells contained?

The Organ of Corti

8

What type of channels open when the stereocillia move? What is created?

Ion channels open in the hair cells, creating a receptor potential

9

What is released once the receptor potential is large enough?

A nerotransmitter is released causing VIII to depolarize

10

How many outer cells are in the organ of Corti? Inner?

3 outer cells, 1 inner

11

Which hair cell is large and round? Inner or outer?

Inner cells are larger and rounder. Outercells are small and thin

12

Which part of the cochlea senses HIGH pitch?

The base of the cochlea, so the Apex senses Low pitch

13

What is the central hearing pathway? What does each mean?

8-C-SLIMA 8:CN VIII....C:Cochlear Nucleus...S:Superior Olivary Nucleus....L:Lateral Lemniscus....I:Inferior Colliculus....M:Medial Geniculate Nucleus....A:Auditory Cortex

14

Where is the cochlear nucleus?

the medulla

15

what percentage of axons of the cochlear nuclei decussate in the lower pons?

80%

16

How do the neurons get from the medial geniculate to the primary auditory cortex?

The internal capsule

17

What is the hearing gyrus in the primary auditory cortex? What brodmann numbers?

Transverse gyri of Heschel, brodmanns 41 and 42

18

Where does the pathway split to orient eyes and head toward a sound?

At the inferior colliculus->to the superior colliculus

19

Where does the pathway split to wake you up with loud noises?

From the Cochlear Nuclei to the RETICULAR formation!

20

What pathway INHIBITS extra noise?

Descending pathway/centrfugal Pathway

21

How does the descending /centrifugal pathway reach the cochlea?

The internal auditory canal

22

What ossicle does the tensor tympani insert into? What CN innervates it?

Malleus, V

23

What innervates the stapedeus muscle?

VII

24

What is mechanical interruption of hearing? What are three examples?

Conductive Deafness: Obsrtuction, OtoSclerosis, Otitis Media

25

What causes Sensorineural Deafness?

disease of the nerves VIII or pathways...Toxins, drugs, infection

26

What is Meniere's Disease?

Overproduction of endolymph/can't absorb it

27

Would a lesion to 8CSLIMA cause total deafness?

Nope, c/o decussation at the lower pons