Facial Development

Question 1

What are the five facial primordia around the stomodeum?

Answer 1

1. frontonasal prominence (AKA frontal process)
2. maxillary prominences (paired)
3. mandibular prominences (paired

• maxillary and mandibular prominences are parts of the 1st pharyngeal arch

Question 2

What covers the stomodeum early in facial development?

Answer 2

buccopharyngeal membrane

Question 3

What 2 things form on the frontonasal process by about the end of the 4th week?

Answer 3

Nasal Placode

Lens Placode

Question 4

What forms in the nasal placode during the 5th week?

And what forms just below it… between the maxillary and nasofrontal prominences?

Answer 4

Nasal Pit forms in the placode

Nasolacrimal Groove forms just below it

Question 5

What forms as the nose develops in the 6th week?

Hint: There are two of them on each placode.

Answer 5

Median and Lateral Nasal Prominences

Question 6

Where does the ear form?

Answer 6

the external acoustic meatus forms in the 1st pharyngeal groove

Question 7

What finally forms from the nasal prominence?

Answer 7

forehead

dorsum + apex of nose

Question 8

What finally forms from the lateral nasal prominences?

Answer 8

alae of the nose

Question 9

What finally forms from the medial nasal prominences?

Answer 9

nasal septum

ethmoid

cribriform plate

Question 10

What finally forms from the maxillary processes?

Answer 10

upper cheek

upper lip

Question 11

What finally forms from the mandibular prominences?

Answer 11

chin

lower lip

lower cheek