READ ME / 1: Embryology - pharyngeal arches and ear Flashcards Preview

ENT Week 1 2017/18 > READ ME / 1: Embryology - pharyngeal arches and ear > Flashcards

Flashcards in READ ME / 1: Embryology - pharyngeal arches and ear Deck (37)
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1

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2

The questions are written using the official Dundee lectures, so you might find it useful to have them open in the background in case you get stuck.

3

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6

Which embryological structures give rise to the face and neck?

Pharyngeal arches

7

When do the pharyngeal arches develop?

Weeks 4 and 5

8

Which pharyngeal arch doesn't really develop into anything?

5th pharyngeal arch

9

Which germ layer contributes to the muscles of the face and neck?

Mesoderm

10

Each pharyngeal arch has four components - what are they?

Mesoderm - develops into muscle

Neural crest - develops into skeleton

Cranial nerve

Artery

 

11

Pharyngeal clefts are found on the (inside / outside) and are lined by ___.

clefts

outside

ectoderm

12

Pharyngeal pouches are found on the (inside / outside) and are lined by ___.

pouches

inside

endoderm

 

 

13

Which cranial nerves are associated with pharyngeal pouches

a) 1

b) 2

c) 3

d) 4-6

a) CN V

b) CN VII

c) CN IX

d) CN X

14

Keeping in mind where it's found, what are the two parts of the 1st pharyngeal arch?

Maxillary part

Mandibular part

15

What are the bones derived from the

a) maxillary

b) mandibular

parts of the 1st pharyngeal arch?

a) Maxilla, zygomatic bone, temporal bone

b) Auditory ossicles (malleus, incus)

16

Which muscles are derived from the 1st pharyngeal arch?

Muscles of mastication

(supplied by V3)

17

Which cranial nerve is derived from the 1st pharyngeal arch?

CN V

Trigeminal nerve and all three divisions

18

Which bones are derived from the 2nd pharyngeal arch?

Stapes

Styloid process of temporal bone

Upper parts of hyoid

19

Which muscles are derived from the 2nd pharyngeal arch?

Muscles of facial expression

20

Which nerve is derived from the 2nd pharyngeal arch?

CN VII

21

Which nerve is derived from the 3rd pharyngeal arch?

CN IX

22

Which pharyngeal cleft is the only one to remain after development?

What does it form?

1st pharyngeal cleft

External acoustic meatus

23

What do the 2nd, 3rd and 4th pharyngeal clefts form before disappearing?

Cervical sinus

24

The 1st pharyngeal pouch forms structures of the ___.

ear

25

The 2nd pharyngeal pouch forms which lymph structure?

Palatine tonsils

26

The 3rd pharyngeal pouch forms which two structures?

Inferior parathyroid glands

Thymus

27

The 4th pharyngeal pouch forms which structures?

Superior parathyroid gland

C cells of thyroid gland

28

What is a placode?

Thickened epithelium

29

From which thickened epithelial structures do the ears arise?

Otic placodes

30

Which germ layer are the otic placodes found in?

Ectoderm