neuro hearing and scent Flashcards
3 pathways of the inner ear
scala vestibuli
scala media
scala tympani
what type of fluid is in each of the scalas
scala media: endolymph
scala vestibuli: paralymph
scala vestibuli: paralymph
what seperates the scala media from the scala vestibuli? what about the scala tympani?
vestibuli: vestibular membrane
tympani: basilar membrane
what are the contents of the scala media?
neural epithelium organ of corti supporting cells hair cells gelatinous pectorial membrane
what are the functions of the dorsal and ventral cochlear nuclei?
dorsal does the majority of auditory processing
ventral does the majority of localization
where is the primary auditory nucleus
it’s on the temporal lobe on the superior temporal gyrus and represented by the transverse gyri of hessel deep inside the lateral fissure
vestibular portion of the ear can be divided into what two parts?
static labyrinth (utricle and saccule) dynamic labyrinth (semicircular canals)
the labyrinth is filled with _____ which is continuous with that of the ___________
endolymph
scala media/cochlea
the _____ is the neural epithelium of the dynamic labyrinth and the _______ is the neural epithelium of the static labyrinth
crista ampularis - dynamic
macula - static
what’s another name for the macula of the static labyrinth?
otolith organ
contents of macula of the static labyrinth
sensory cells support cells gelatinous substance calcium carbonate otoconia (stones) assymetrical cilia (coming off sensory cells
what does the macula of the static labyrinth sense?
linear acceleration (gravity)
what does to crista ampularis consist of?
support cells
asymmetrical hair cells
cupula (gelatinous substance
what is the function of the cupula?
blocks the passage of fluid in the semicircular canal and deflects to sense angular motion
how do we sense angular motion?
we move our heads but the fluid in the dynamic portion of our ear stays still causing the cupula to deflect.
______ cells in the olfactory epithelium give rise to ________, which have odor receptors, and centrally directed axons that make up the _______
bipolar
peripherally directed dendrites
olfactory nerve
axons from the olfactory bipolar cell synapse with dendrites of the ______ which is unique to the ________
mitral cell
olfactory bulb
path of scent:
received by the bipolar n.
sent to mitral n. in olfactory bulb
sent to primary olfactory cortex in the piriform lobe
where is the primary olfactory cortex
piriform lobe
what are the three components of the piriform lobe
cortex overlying the amygdala
uncus
rostral portion of the entorhinal cortex
sensory bodies of origin for CN V that inn extracted tooth
trigeminal gasserion/semilunar ganglion
