L44 Gross Ear

Question 1

Cone of light location

Answer 1

Lateral wall of middle ear cavity on tympanic membrane

Question 2

Middle ear is main part of the what bone

Answer 2

Petrous portion of temporal

Question 3

Tympanic cavity regions

Answer 3

Tympanic cavity proper: medial

Epitympanic recess: superior to membrane

Question 4

Relay center for sound waves

Answer 4

tympanic cavity

Question 5

Posteriorly, middle ear leads to

Answer 5

aditus ad antrum

Question 6

Middle ear borders

Answer 6

Superior: Tegmen tympani
Inferior: Jugular wall
Lateral: tympanic membrane
Medial: inner ear labyrinth
Anterior: carotid wall
Posterior: mastoid wall

Question 7

Fenstra vestibuli

Which window

Answer 7

Oval window

Question 8

Fenestra cochlea

Which window

Answer 8

Round window

Question 9

Inner ear labyrinth seen from middle ear

Answer 9

Promontory
Fenestra vestibuli
Fenestra cochlea
Facal canal prominence
Lateral semicircular canal prominence
Tensor tympani tendon

Question 10

Openings in carotid wall

Answer 10

auditory tube

semicanal for tensor tympani

Question 11

Origin of stapedium muscle

Answer 11

pyramidal eminence

Question 12

Mastoid wall

Answer 12

Aditus ad antrum

Pyramidal eminence

Question 13

Aditus ad antrum leads to

Answer 13

mastoid air cells

Question 14

Stapedius significance

Answer 14

smallest striated muscle in body

Question 15

Stapedius function

Answer 15

pulls head of stapes posteriorly

Question 16

Tensor tympani inserts into

Answer 16

handle of malleus

Question 17

Tensor tympani path

Answer 17

Runs posteriorly thru canal then bends laterally

Question 18

Middle ear vessels

Answer 18

tympanic branches of carotid branches

Question 19

Tympanic plexus of nn.

Supplies

Answer 19

mastoid air cells and auditory tube

Question 20

Tympanic plexus of nn. formed by
Symp
Para

Answer 20

Symp: Cartoticotympanic nn
Para: Tympanic br. of CNIX

Question 21

Greater petrosal
Branch of
Ganglion

Answer 21

CNVII
Geniculate ganglion
Parasympathetic

Question 22

Lesser petrosal
Branch of
Ganglion

Answer 22

CNIX

Parasympathetic to Otic ganglion

Question 23

Lesser petrosal runs from ____ to ____

Answer 23

Runs from hiatus of lesser petrosal n. to foramen ovale (otic ganglion below ovale)

Question 24

Otic ganglion supplies (symp/para) to ______

Answer 24

parasympt to parotid

Question 25

Semicircular canals control

Answer 25

balance and position

Question 26

Path of chorda tympani

Answer 26

Ascends anteriorly thru middle ear
Crosses medial surface of tympanic membrane
Passes between handle of malleus and incus
Exits cavity thru petrotympanic fissure

Question 27

Facial nerve path

Answer 27

Enters facial canal
Run posterioly
Over oval window, goes inferior
Behind round window
Inferiorly to stylomastoid foramen