auditory lec 1

Question 1

Is the temporal bone part of the neurocranium or viscerocranium?

Answer 1

neurocranium

Question 2

Is the temporal bone inferior or superior to the parietal bone?

Answer 2

inferior

Question 3

Is the temporal bone anterior or posterior to the occipital bone?

Answer 3

anterior

Question 4

what are the parts of the squamous segment? (4)

Answer 4

1. zygomatic process (cheek bone part)
2. temporalis muscle
3. masseter muscle (jaw clench)
4. mandibular fossa (where jaw bone tucks into)

Question 5

what are the parts of the tympanic segment? (3)

Answer 5

1. supports external auditory canal
2. styloid process (sharp, deep in neck)
3. attaches stylohyoid (muscle that pulls throat up)

Question 6

what is the mastoid segment? what does it do when vibration is placed on it?

Answer 6

• giant bone behind ear
• vibrates ossicles

Question 7

what does the petrous segment contain? (3)

Answer 7

1. cochlea
2. vestibular structures
3. internal acoustic meatus (lets thru cranial nerves 7 and 8)

Question 8

The mandibular fossa is on which part?

Answer 8

squamous (jaw bone)

Question 9

the zygomatic process is on which part of the temporal bone?

Answer 9

squamous (cheek bone)

Question 10

The internal acoustic meatus is on which part?

Answer 10

petrous

Question 11

the styloid process is on which part of the temporal bone?

Answer 11

tympanic

Question 12

what are the parts of the outer ear? (2)

Answer 12

1. pinna
2. ear canal (EAM/EAC)

Question 13

what is the border of outer and middle ear?

Answer 13

tympanic membrane

Question 14

what are the parts of the middle ear?

Answer 14

ossicles

Question 15

what are the parts of the inner ear? (1) is there anything more medial?

Answer 15

1. cochlea (contains nerve endings that convert acoustic + mechanical energy into nerve signals)
2. only thing more medial is auditory nerve

Question 16

what are the parts of the vestibular system? what does it do?

Answer 16

• parts: 3 semicircular canals
• function: provides info on balance and orientation

Question 17

T or F: the pinna is fully developed in utero

Answer 17

true

Question 18

what is the external auditory canal composed of?

Answer 18

• 1/3 cartilage, 2/3 bone

Question 19

what are the 4 ways the external auditory canal is protected?

Answer 19

1. s-shaped/air filled
2. epidermal lining
3. hair follicles
4. cerumen-producing glands

Question 20

the tympanic membrane is ___ shaped and the max peak is the ___

Answer 20

concave, umbo

Question 21

what are the 2 main parts of the tympanic membrane?

Answer 21

1. pars tensa (largest)
2. pars flaccida (much smaller)

Question 22

T or F: the tympanic membrane is opaque

Answer 22

false – translucent

Question 23

how can you tell if you’re looking at a left or right ear drum?

Answer 23

• right: malleus angled toward 1, cone of light at 5
• left: malleus angled toward 11, cone of light at 7

Question 24

T or F: ear tubes stay inside the ears forever

Answer 24

false – fall out after 4-18 months

Question 25

T or F: ear tubes cause severe conductive hearing loss

Answer 25

false – mild conductive hearing loss (3-4dB)