ear

Question 1

where are the organs for hearing and balance found

Answer 1

internal ear

Question 2

organ for hearing

Answer 2

cochlea

Question 3

organ for balance

Answer 3

semicircular canals

Question 4

concha is made up of

Answer 4

cymba (upper) and cavity (lower)

Question 5

EAM is a canal that leads from

Answer 5

auricle to tympanic membrane

Question 6

what separates the EAM from middle ear

Answer 6

tympanic membrane

Question 7

what bone attaches to the tympanic membrane

Answer 7

malleus

Question 8

middle ear is in what part of the skull

Answer 8

petrous part of temporal bone

Question 9

two parts of the middle ear

Answer 9

• tympanic cavity

- epitympanic recess

Question 10

middle ear communicates with what posteriorly

Answer 10

mastoid area

Question 11

middle ear communicates with what anteriorly

Answer 11

nasopharynx

*PT tube connects middle ear to nasopharynx

Question 12

roof of middle ear

Answer 12

• epitympanic recess
• “tegmental wall”
• separates it from MCF

Question 13

floor of middle ear

Answer 13

• “jugular wall”
• separates it from IJV
• has an opening for the tympanic n

Question 14

tympanic n is a branch of what CN

Answer 14

glossopharyngeal (CN9)

Question 15

lateral wall of middle ear

Answer 15

• tympanic membrane
• “membranous wall”
• chorda tympani (CN7-facial) crosses here

Question 16

medial wall of middle ear

Answer 16

• “labyrinthine wall”

- has a prominence for facial n

Question 17

tympanic plexus of nerves is found where

Answer 17

on the promotory of the medial wall

Question 18

tympanic plexus

Answer 18

• begins with tympanic branch (CN9)
• also has a branch from internal carotid plexus
• lesser petrosal n leaves it

Question 19

tympanic plexus of nn supplies

Answer 19

• mucosa of middle ear
• mastoid area
• PT tube

Question 20

where does chorda tympani n enter the middle ear

Answer 20

posterior (mastoid) wall

Question 21

chorda tympani n exits the middle ear via

Answer 21

anterior (carotid) wall

Question 22

what does the anterior wall separate middle ear from

Answer 22

• PT tube

- internal carotid a and plexus

Question 23

what m enters ear through anterior wall

Answer 23

tensor tympani m (above PT tube)

Question 24

what “feeds” into the tympani plexus of nn

Answer 24

• tympani n (CN9) from floor

- branch from internal carotid plexus from anterior

Question 25

what exits the tympani plexus

Answer 25

lesser petrosal n (leaves anterior wall)

Question 26

PT tube connects

Answer 26

middle ear to nasopharynx

Question 27

what connects the tympanic membrane to the oval window

Answer 27

ossicles

Question 28

name the three ossicle bones

Answer 28

incus, malleus, stapes

Question 29

which bone is attached to the tympanic membrane

Answer 29

malleus

Question 30

what attached to the oval window on medial wall

Answer 30

stapes

Question 31

tensor tympani m

Answer 31

- origin: PT tube, greater wing of sphenoid, petrous part of temporal bone - insertion: malleus - action: pulls malleus medially; tenses tympanic membrane; reduces force of vibrations - nerve: n to medial pterygoid m (CNV3)

Question 32

stapedius m

Answer 32

- origin: pyramidal eminence - insertion: neck of stapes - action: contract in response to loud noise; prevent excessive oscillations - n to the stapedius m (facial n)

Question 33

internal ear

Answer 33

- petrous part of temporal bone - bony: cochlea; vestibule; semicircular canals - membranous: utricle and saccule; ducts

Question 34

organs of balance

Answer 34

semicircular duct, utricle, and saccule

Question 35

organ of hearing

Answer 35

cochlear duct | -contains scala vestibuli (waves to apex) and scala tympani (waves to base)

Question 36

receptor of auditory stimuli

Answer 36

spiral organ (organ of Corti)

Question 37

special afferent fibers to the internal ear

Answer 37

vestibulocochlear n (CN8)

Question 38

cochlear n

Answer 38

hearing

Question 39

vestibular n

Answer 39

balance

Question 40

nerve supply to spiral organ and cochlear duct

Answer 40

cochlear n (CN8)

Question 41

nerve supply to semicircular ducts, utricle, and saccule

Answer 41

vestibular n (CN8)