8: Embryology 2 - face, palate and nasal cavities Flashcards Preview

ENT Week 1 2017/18 > 8: Embryology 2 - face, palate and nasal cavities > Flashcards

Flashcards in 8: Embryology 2 - face, palate and nasal cavities Deck (35)
Loading flashcards...
1

Which pharyngeal arches give rise to

a) the muscles of facial expression

b) the maxilla, mandible, zygoma and temporal bone

c) the muscles of mastication?

a) Pharyngeal arch 2

b) Pharyngeal arch 1

c) Pharyngeal arch 1

2

Is pharyngeal arch 5 relevant?

No, doesn't develop into anything

3

Which cranial nerves supply the first pharyngeal arch and the second pharyngeal arch?

1st - CN V

2nd - CN VII

4

What are the prominences which appear on the face in Week 4 of development?

Frontonasal prominence

2 maxillary prominences

2 mandibular prominences

5

What form on the frontonasal prominence in Week 4?

Nasal placode

thickened ectoderm which gives rise to nasal structures

6

What do the nasal placodes go on to form?

Nasal structures

including ofactory epithelium

7

What developmental structures are found inferior to the mandibular prominences?

2nd and 3rd pharyngeal arches

8

What space gives rise to the mouth?

Stomodeum

9

Which nasal swellings form additional to the nasal placodes in Week 5?

 2 medial nasal prominences

2 lateral nasal prominences

10

What germ layer are the 

a) medial nasal swellings

b) lateral nasal swellings

c) maxillary prominences

made up of?

a) Endoderm

b) Ectoderm

c) Mesoderm

11

Why do the maxillary prominence and medial nasal prominence fuse sooner than "" and the lateral prominence?

Lateral nasal prominence and maxillary prominence form nasolacrimal groove

12

What lies between the maxillary prominence and the lateral nasal prominence?

Nasolacrimal groove

13

What do the nasolacrimal grooves develop into?

Nasolacrimal ducts

14

What makes up the upper lip at 10 weeks?

2 maxillary prominences

2 medial nasal prominences

15

What makes up the lower lip at 10 weeks?

2 mandibular prominences

16

Which prominence makes up the bridge and septum of the nose?

Frontonasal prominence

17

Which prominences make up the crest and tip of the nose?

Medial nasal prominences

18

Which prominences make up the alae of the nose?

Lateral nasal prominences

19

What external structure of the nose is formed by the fusion of the right and left medial nasal prominences?

Philtrum

20

Which teeth are found in the intermaxillary segment?

4 incisors

21

The intermaxillary segment (i.e the fused right and left medial nasal prominences) give rise to what structure of the nasal and oral cavities?

Primary palate

i.e the roof but not the lateral parts

22

The intermaxillary segment gives rise to the primary palate.

What gives rise to the lateral parts of the palate?

Maxillary prominences

23

How big is the primary palate compared to the secondary palate?

Much smaller in comparison

24

What fuse to form the secondary palate?

Right and left palatine shelves of the maxillary prominences

25

What structures fuse to form the palate?

Where do they come from?

Primary palate - from intermaxillary segment

Secondary palate - from left and right maxillary prominences

26

What hole forms just posterior to the incisor teeth at the anterior part of the palate?

Incisive foramen

27

What is found in the incisive foramen?

Blood vessels and nerves

28

What forms at the posterior part of the palate?

Uvula

29

What is a cleft?

Fissure or long opening

30

What congenital abnormalities can occur if the prominences of the upper lip fail to unite properly?

Cleft lip

Cleft palate