Development of face Flashcards Preview

Head and Neck > Development of face > Flashcards

Flashcards in Development of face Deck (33)
Loading flashcards...
1

What is the face of the embryo made up of early in development?

Frontonasal prominence

1st pharyngeal arch
-maxillary prominence
-mandibular mandibular prominence

Stomatodeum

2

What is the stomatodeum?

Buccopharyngeal membrane

3

What happens to the buccopharyngeal membrane? Why?

Breaks down
because it is avascular, lacks blood supply

4

Where are the eyes located on the face of the embryo early in development?

Sides of the frontonasal prominence

5

What does the frontonasal prominence develop into?

Forehead

Bridge of nose, nose

Philtrum

6

What is the philtrum?

Ridge above the upper lip in the middle

7

What do the maxillary prominences develop into?

Cheeks

Lateral upper lip

Lateral upper jaw

8

What do the mandibular prominences develop into?

Lower lip

Jaw

9

What structures contribute to the development of the nose?

Nasal placodes, pits

Medial nasal prominence

Lateral nasal prominence

10

What is a placode?

Ectodermal thickening
differentiates to give rise to sensory tissue

11

What happens to the nasal placodes?

Sinks to form pits called the nasal pits

12

Where are the nasal placodes and pit located?

Frontonasal prominence

13

What is the medial nasal prominence?

Prominence medial to the nasal pit

14

What is the lateral nasal prominence?

Prominence lateral to the nasal pit

15

How does the nose develop?

Maxillary prominences grow towards each other
push the medial and lateral nasal prominences with them
medial nasal prominences fuse in midline
medial nasal prominence fuses with maxillary prominence

16

What does fusion of the medial nasal prominences form?

Intermaxillary segment

17

What is the intermaxillary segment made up of?

Philtrum

Upper jaw

Primary palate

18

How are the nasal and oral cavities initially related to each other during development?

Are continuous with each other

19

What happens to the initial relationship between the nasal and oral cavities during development?

They are completely separated
by the secondary palate

20

How does the secondary palate form?

Maxillary prominence gives off two palatal shelves
these grow vertically downwards on each side of tongue

tongue drops
the palatal shelves then grow towards each other
fuse in midline

21

Why does the tongue drop during development?

Mandible grows larger
increases space in oral cavity

22

What happens to the nasal cavity during development?

Separates into right and left nasal cavities

23

How is the nasal cavity separated into right and left nasal cavities during development?

Nasal septum in midline
grows downwards
fuses with palatal shelves

24

What is a cleft lip?

Opening in upper lip that may extend into nose

25

How does a cleft lip form?

Failure of fusion of medial nasal prominence and maxillary prominence

26

What is a cleft palate?

Opening in palate into the nose

27

How does a cleft lip and palate form?

Failure of fusion of medial nasal prominence and maxillary prominence
failure of fusion of palatal shelves

28

Where are the ears of the embryo initially located early in development?

Neck

29

What causes the ears to migrate from the embryonic neck to their normal position?

Growth of mandible

30

What is foetal alcohol syndrome?

Group of conditions that occur in person whose mother consumed significant amounts of alcohol during pregnancy