SPAUD 210: 4/24

facial nerve

what is the stapedius muscle innervated by?

neck/head of stapes

what is the insertion of the stapedius muscle?

primary muscle of acoustic reflex

function of stapedius muscle

primary muscle of acoustic reflex

function of tensory tympani muscle

dampens transmission during loud sounds

what does acoustic reflex mean?

trigeminal

what is the tensory tympani innervated by?

upper manubrium/anterior process of malleus

what is the insertion of the tensor tympani muscle?

tensor tympani

stapedius muscle

closed

is the eustachian tube normally open or closed?

horizontal, short

the eustachian tube is more ____ and ___ in kids

levator veli palatini

tensor veli palatini

what muscles open the eustachian tube?

cochlea

organ for hearing

semicircular canals

utricle

saccule

what are the components of the vestibular system?

equilibrium

what does the vestibular system help maintain?

1. kinetic part

2. vestibular part

what are the two parts to the vestibular system

perception of the rotation and acceleration of head

what does the kinetic part of the vestibular system control?

position in space in the vertical plane (gravity)

what does the static part of the vestibular system control?

endolymphatic duct

connects utricle and saccule

endolymphatic duct

cochlear duct

K (more inner layer)

utricle

saccule

crysta ampullaris

sensory cell of semicircular canals

cupula

what are the crista ampullaris embedded in?

crista ampullaris

copula

top yellow part here

cupula

top part of crista ampullaris, gelatin-like

cupula

what are the cilia embedded in?

vertigo

what happens when your vestibular system goes crazy

hystagmus

involuntary eye movement with vertigo

petrous portion

where is the inner ear located in terms of the skull?

cartilage

early on, what is the inner ear separated by?

ampulla

thing in the inner ear that contains sensory cells on each semicircular canal

sensory cells

what do the ampulla contain?

ampulla

help you be aware of your body in rotation

semicircular canal function

fluid

what is the inner ear filled with

perilymph

inside bony part of cochlea

endolymph

inside membrane part of cochlea

2.5

how many turns does the cochlea have?

tonotopic organization

frequencies are mapped on the cochlea -- different parts of the cochlea respond to different frequencies

base of cochlea

where are high frequency sounds heard

apex of cochlea

where are low frequency sounds heard?

modiolus

bony core of cochlea

modiolus

helicotrema

very top of cochlea

helicotrema

spiral lamina

little shelf on bone

spiral lamina