page 138-147 Flashcards
membranous and bony labyrinth
inner ear
acoustic apparatus
vestibular app
semicircular canal
inner ear
muscles of middle ear to dampen sound
tensor tympani
stapedius
paralysis of muscle of middle ear
hyperacusis
V3;CN7
tensor tympani; stapedius
middle ear to pharynx
eustacian tube
equalize pressur b/n tympanic cavity and nasopharynx
eustacian tube
Hearing loss
presbycusis
loss occuring gradually with aging b/c of changes in inner ear or middle ear
presbycusis
conductive loss
thickening and stiffening of cochlear basilary membrane
sensorineural loss
loss of hair and or nerve cells
nystagmus
involuntary rapid and repetitive movements of eyes
irritation to labyrinth
vestibular nerve or nuclei
cerebellum
visual system
cerebral cortex
nystagmus
rhythmic oscillations are slow to one side
and rapid to other
nystagmus
defined by direction of rapid reflex movement
nystagmus
vertical , occasional vertical or rotary
nystagmus
cold caloric test
instill h2o to EAM stimulates nystagmus
colc caloric test
cool water fast component to side opposite
warm waterfast component to stimulated side
Cn 9 glossopharyngeal
originates in ant surface of medulla oblongata
pass lateral in pcf
leaves skull via jug foramen
motor of CN9
stylopharyngeus
general sensory cell bodies of CN 9 are
sup and inf ganglion of CN9
mucosa of pharynx
post 3rd of mouth
sensory of CN 9
visceral sensory
taste on post 3rd of tongue
gag reflex
chemo, baroreceptors- carotid body, sinus
PS/ secromotor
parotid via otic ganglion
preganglion of PS CN 9
leave glossopharyngeal narve as tympanic nerve
enter middle ear caivty
contribute to tympanic plexus
reform as lesser petrosal nerve
leave cranial cavity via 4amen ovale
enter otic ganglion
post gang of PS secromotor
carried by auricultemporal nerve to parotid glandn
widest distribution CN
CN 10
supply viscera of kneck,
thorax, abd
to left colic felxure
CN X
course of vagus
leave medulla
pass jug foramen
desc. kneck in carotid sheath
Post mediastinum
enter abd cavity with esophogus
right vagus course
cross ant surface of r. rubclavian art
enter thorax posterolat to BC trunk, lat 2 trachea,medial to azygous vein
pass post to root of right lung
travels with esophogus
enters abd behind esophogus
post vagal trunk
left vgus nerve
enter thorax in front of L. subclavian art. behind L. braciocephalic vein
cross left side of aortic arch
pass behind left lung
travels with esophogus
enters abd in front of esophogus
br of esophogeal plexus unite
Ant vagal trunk
br of vagus
menineal
to dura
auricular br of Vagus
to auricle and post 1/2 of EAM
form pharyngeal plexus
pharyngeal br of vagus