Lab Quiz 7 Flashcards
tophat chapter 9 (9 cards)
what are you two different divisions of the vestibular system of the inner ear?
static labyrinth: otolith organs (utricle and the saccule) are sentivie to linear and vertical acceleration
kinetic labyrinth: semicircular canals which are important for detecting rotational head movements specifically, tilting forward or backwards
which eye muscles are innervated by which cranial nerves and what direction do they control?
superior rectus: up and lateral, innervated by CN III
lateral rectus: lateral, innervated by CN VI
inferior rectus: down and lateral, innervated by CN III
inferior oblique: up and medial, innervated by CN III
medial rectus: medial, innervated by CN III
superior oblique: down and medial, innervated by CN VI
what are each section of the cerebellum responsible for?
vermis: related to saccadic events (rapid eye movements) and vergence (eyes moving together to focus on object)
flocculus and nodulus of the cerebellum: related to slow pursuit movements
what are the two symptoms that disorders of equilibrium and balance usually present with?
vertigo: sense of spinning or dizziness
ataxia: abnormal or uncoordinated movements
where is Wernicke’s area?
the superior posterior portion of the temporal lobe
what are the functions of the medial longitudinal fasciculus, trapezoid body, contralateral inferior colliculus, and transverse temporal gyrus?
medial longitudinal fasciculus: connects cranial nerve nuclei that supply muscles involved in conjugate eye movements and head neck movements
trapezoid body: the crossing fibers from the cochlear nuclei
contralateral inferior colliculus: most of the axons from the cochlear nuclei synapse here
transverse temporal gyrus/heschel’s gyrus: cortical region for most axons leaving the medial geniculate nucleus to synapse in
what is tonotopic organization?
tonotopic organization and
projections are maintained from the
cochlea all the way to the primary
auditory cortex where the front of the cortex corresponds to the apex of the cochlea which encodes low frequency sounds and the bak of the cortex corresponds to the base of the cochlea which encodes high frequency sounds
what do results of the rinne test mean?
normally, air conduction is better than bone conduction, if bone conduction is more efficient then there is conductive hearing loss,
if air conduction is more efficient and hearing is decreased in the
affected ear then there is sensorineural hearing loss
what do results of the weber test mean?
if tuning fork sounds louder in the affected ear then there is conductive hearing loss in the affected ear
if tuning fork sounds louder in the good ear then there is sensorineural hearing loss in the affected ear
