Visual & Auditory Pathways Flashcards Preview

Neuroanatomy > Visual & Auditory Pathways > Flashcards

Flashcards in Visual & Auditory Pathways Deck (25):
1

What bone houses the Organ of Corti and the vestibular apparatus?

petrous part of temporal bone

2

The scala vestibuli and scala tympani are filled with what substance?

perilymph

3

The cochlear duct is filled with what substance?

endolymph

4

Where in the cochlear is the spiral ganglion embedded?

modiolus

5

Explain how sound waves gets to the spiral ganglion

sound --> external auditory canal --> tympanic membrane --> malleus --> incus --> stapes --> oval window --> endolymph of cochlear duct --> inner hair cells of organ of Corti --> bipolar neurons that make up spiral ganglion

6

What is the difference between inner and outer hair cells of organ of corti?

inner hair cells extend into endolymph and involved in hearing
outer hair cells insert into tectorial membrane and tulle hair cells of inner group

7

The scala vestibuli opens in the middle ear via

oval window

8

The scala tympani opens into middle ear via

round window

9

A patient with total deafness is more likely to have a central or peripheral problem?

peripheral

10

What are the components of the kinetic labyrinth? What is it involved with?

three semicircular canals & their ampullae
angular acceleration

11

What are the components of the static labyrinth? What is it involved with?

utricle & saccule
gravity, position in space
linear acceleration

12

The canals, ampullae, saccule and utricle are all filled with what substance?

endolymph

13

What are regions of hair cells called in the static labyrinth? In kinetic?

static = maculae
kinetic = cristae

14

What are the differences between maculae and cristae?

cristae have cupula
maculae have otoliths

15

DRAW THE AUDITORY PATHWAY

See notes

16

DRAW THE VESTIBULAR PATHWAY

See notes

17

What do rods detect?

low light

18

What do cones detect?

colour & daylight

19

Axons of what cells form the optic nerve?

retinal ganglion cells

20

Where are cones concentrated?

macula lutea of fovea centralis

21

What is an anopsia?

any loss of vision (one or both eyes)

22

What is a hemianopsia?

if you lose half the visual field in one or both eyes

23

What is a quadrantinopsia?

If you lose a quarter of the visual field in one or both eyes

24

WHat is a homonymous hemianopsia?

If you lose half the visual field in both eyes and its the same visual field (both left or both right)

25

What is a heteronymous hemianopsia?

If you lose half the visual field in both eyes and it is the opposite visual field (left & right)