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Flashcards in Exam 4 Ear Deck (103)
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1

What is the ectodermal thickening on the lateral “head”

Placode

2

What does the placode give rise to

The auditory pit, then auditory vesicle

3

What does the auditory vesicle give rise to

Most of the membranous inner ear

4

What secondary embryologic feature is derived from the 1st pharyngeal pouch

The auditory tube and tympanic cavity

5

What is the malleus derived from

The dorsal end of the ventral mandibular cartilage

6

What is the incus developed from

The dorsal end of the first pharyngeal arch

7

What is the stapes derived from

The dorsal end of the second pharyngeal arch

8

What is the tympanic membrane developed from

Interstitial mesoderm

9

What is the external acoustic canal developed from

First pharyngeal groove

10

What is the auricle developed from

A groove next to the 1st pharyngeal groove

11

What are the 3 portions of the ear

External, middle, inner

12

What are the 2 features of the external ear

The auricle and external acoustic meatus

13

What is another name for the auricle of the external ear

Pinna

14

What is the function of the auricle

Funnel sound waves into external acoustic meatus

15

What are the 3 extrinsic muscles of the auricle

Anterior auricular muscle, superior auricular muscle, and posterior auricular muscle

16

What are the intrisic muscles of the auricle

Helicus major/minor, tragicus, antitragicus, transverse muscle of the auricle, oblique muscle of the auricle

17

What is the shape of the external acoustic meatus

S shaped

18

Where is the medial 2/3 of the external acoustic meatus

Within temporal bone

19

What glands are located in the external acoustic meatus

Modified sweat glands producing cerumen

20

Where does the external acoustic meatus terminate

At the tympanic membrane

21

How is blood supplied to the external ear

Posterior auricular branch, anterior auricular branch, auricular branch

22

What is the sensory supply to the external ear

Auriculotemporal nerve, auricular branch, great auricular nerve (C2 and C3)

23

What is the motor supply of the external ear

Temporal and posterior auricular branches

24

What is the sympathetic supply to the external ear

From superior cervical ganglion

25

Where is the middle ear

Small space between tympanic membrane and inner ear

26

What are the 2 parts of the middle ear

Tympanic cavity and epitympanic recess

27

What are the 3 small bones in the middle ear

Incus, malleus, stapes

28

What 2 muscles are located in the tympanic cavity

Stapedius and tensor tympani

29

What is the blood supply to the middle ear

Anterior tympanic branch and tympanic branch

30

What is the sensory supply of the middle ear

Tympanic nerve of CN IX (pregang parasymp)