Ear

Question 1

external ear (auricle or pinna)

Answer 1

inn by GSA by auriculotemporal, lesser occipital, great auricular
skin gets contributions from VII, IX, and X

Question 2

auricular hematoma

Answer 2

blood supply is by superficial temporal and posterior auricular a
hemorrhage from these vessels will accumulate in the subcutaneous tissue
can leads to cauliflower ear if not treated

Question 3

removal of ear wax

Answer 3

may avulse the tympanic membrane and ossicles

Question 4

tympanic membrane outer epidermis or skin

Answer 4

inn by GSA from trigeminal and vagus

Question 5

tympanic membrane middle fibrous layer

Answer 5

form the pars tensa

absence of pars tensa in antero-superior quadrant forms the pars flaccida

Question 6

tympanic membrane inner mucous membrane

Answer 6

inn by GVA fibers of the glossopharyngeal n via the tympanic plexus

Question 7

chorda tympani n

Answer 7

runs through the anterior and posterior mallar folds

Question 8

superior anterior to TM

Answer 8

auditory tube

Question 9

inferior anterior to TM

Answer 9

carotid canal

Question 10

inferior posterior to TM

Answer 10

fenestra cochleae

Question 11

superior posterior to TM

Answer 11

long process of incus, stapes, fenestra vesibuli

Question 12

middle ear

Answer 12

vibrations lead to movement of bones which leads to fluid motion

Question 13

otitis media

Answer 13

inflammation of the middle ear leading to accumulation of fluid
more common in infants because their auditory tubes are oriented horizontally

Question 14

facial n.

Answer 14

internal auditory meatus to facial canal

facial canal is just above the middle ear cavity

Question 15

lesion to facial n

Answer 15

Bells palsy

Question 16

lesion to greater petrosal n

Answer 16

decreased lacrimation in ipsilateral eye

Question 17

lesion to stapedius n

Answer 17

hyperacusis, increased sensitivity to certain sounds

Question 18

lesion to chorda tympani n

Answer 18

loss of taste to ant 2/3 of tongue

decreased salivation from submandibular and sublingual glands

Question 19

lesion to n to post. digastric m

Answer 19

lower jaw deviating towards normal side when the mouth is open wide

Question 20

ossicles

Answer 20

malleus, incus, stapes

Question 21

otosclerosis

Answer 21

ossification or scarring of small ossicular joints that prevents the transmission of sound from the tympanic membrane to the fenestra vestibuli

Question 22

tensor tympani m

Answer 22

inn by mandibular n of V

tightens the tympanic membrane and attenuates its vibrations

Question 23

stapedius m

Answer 23

inn by facial n VII

pulls the stapes out of the fenestra vestibuli which protects us from loud sounds

Question 24

cochlear division R

Answer 24

inn the organ of Corti and conveys auditory information

Question 25

vestibular division R

Answer 25

inn the maculae utricle and saccule and the cristae ampullaris of semicircular ducts
conveys static and dynamic position sense information for equilibrium

Question 26

osseous labyrinth

Answer 26

semicircular canals 
vestibule
aqueduct of the vesituble 
perilymphatic duct 
cochlea
scala vestibuli

Question 27

vestibule

Answer 27

house the utricle and saccule

Question 28

cochlea

Answer 28

modiolus houses the cochlear n

spiral lamina projects from the modiolus like the thread of a screw

Question 29

scala vestibuli and scala tympani

Answer 29

communicates with helicotrema

Question 30

membranous labyrinth

Answer 30

semicircular ducts
utricle and saccule
coclear duct
organ of corti

Question 31

organ of corti

Answer 31

contains R for hearing

exposure to excessive amounts of noise leads to partial destruction of the organ of corti