Unit VIII - Ear Pt. 1 Flashcards Preview

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Flashcards in Unit VIII - Ear Pt. 1 Deck (66)
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1

What is the embryologic structure of ectodermal thickening on the lateral "head" that gives rise to the ears?

Placode

2

What is the pathway of the embryological formation of the ear?

Placode --> auditory pit --> auditory vesicle --> most of membranous inner ear

3

What structures of the ear are derived from the first pharyngeal pouch?

Auditory tube and tympanic cavity

4

From where is the malleus derived?

Dorsal end of the ventral mandibular cartilage

5

From where does the incus arise?

Dorsal end of the first pharyngeal arch

6

What ear structure is derived from the dorsal end of the second pharyngeal arch?

Stapes

7

From where does the tympanic membrane develop?

Interstitial mesoderm

8

From where does the external acoustic canal develop?

First pharyngeal groove

9

From where does the auricle develop?

A groove next to the first pharyngeal groove

10

What are the three portions of the ear?

External, middle, and inner

11

What is another name for the auricle?

Pinna

12

What tissue makes up the auricle?

Cartilage

13

What is the function of the auricle?

Funnel sound waves into the external acoustic meatus

14

What are the three extrinsic ear muscles that position the auricle?

Anterior, superior, and posterior auricular muscles

15

Which auricular muscle inserts on the front of the helix?

Anterior auricular muscle

16

Which auricular muscle is the largest?

Superior auricular muscle

17

Where does the superior auricular muscle insert?

On superior side of auricle

18

What is the smallest auricular muscle?

Anterior auricular muscle

19

Where does the posterior auricular muscle insert?

Lower, posterior aspect of concha

20

What are the intrinsic ear muscles?

Helicis major and minor, tragicus, antitragicus, transverse muscles of the auricle, oblique muscles of the auricle

21

About how long is the external acoustic meatus?

1 inch

22

What shape is the external acoustic meatus?

S-shaped

23

What part of the external acoustic meatus is within a bone? Which bone?

Medial 2/3; temporal bone

24

What covers the entire length of the external acoustic meatus?

Skin with modified sweat glands

25

What do the modified sweat glands of the external acoustic meatus produce?

Cerumen

26

Where does the external acoustic meatus terminate?

Tympanic membrane

27

What motion makes otoscopic examination possible even though the length of the external acoustic meatus is not straight?

Gently pulling out, down, and forward on the lobule

28

What makes up the blood supply to the external ear?

Posterior auricular branch of external carotid artery
Anterior auricular branch of superficial temporal artery
Auricular branch from the occipital artery

29

What makes up the sensory supply to the external ear?

Auriculotemporal nerve of the mandibular division of trigeminal
Auricular branch of vagus
Great auricular nerve (C2 and C3)

30

What makes up the motor supply to the external ear?

Temporal and posterior auricular branches of the facial nerve