Flashcards in Visual & Auditory Pathways Deck (25):
What bone houses the Organ of Corti and the vestibular apparatus?
petrous part of temporal bone
The scala vestibuli and scala tympani are filled with what substance?
The cochlear duct is filled with what substance?
Where in the cochlear is the spiral ganglion embedded?
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
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
The scala vestibuli opens in the middle ear via
The scala tympani opens into middle ear via
A patient with total deafness is more likely to have a central or peripheral problem?
What are the components of the kinetic labyrinth? What is it involved with?
three semicircular canals & their ampullae
What are the components of the static labyrinth? What is it involved with?
utricle & saccule
gravity, position in space
The canals, ampullae, saccule and utricle are all filled with what substance?
What are regions of hair cells called in the static labyrinth? In kinetic?
static = maculae
kinetic = cristae
What are the differences between maculae and cristae?
cristae have cupula
maculae have otoliths
DRAW THE AUDITORY PATHWAY
DRAW THE VESTIBULAR PATHWAY
What do rods detect?
What do cones detect?
colour & daylight
Axons of what cells form the optic nerve?
retinal ganglion cells
Where are cones concentrated?
macula lutea of fovea centralis
What is an anopsia?
any loss of vision (one or both eyes)
What is a hemianopsia?
if you lose half the visual field in one or both eyes
What is a quadrantinopsia?
If you lose a quarter of the visual field in one or both eyes
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)