Face Development

Question 1

Lower face development:

Inferior to _____

Once fused at the _____, forms the ______

Seperates _______ from the developing _____

Answer 1

Stomodeum.
*2 mandibular processes migrate to the facial region.

Midline, mandibular arch

Stomodeum, heart

Question 2

Lower face development: mandibular arch

Gives rise to ______

Answer 2

Lower face, mandible (includes teeth), structures associated with mandible (lips), tongue

Question 3

Lower face development: lower face timeline

4th week-

5-6 weeks-

10th week-

Answer 3

Proliferation

Differentiation

Morphogenesis (fetal stage)

Question 4

Upper face development: frontonasal process (middle face)

1.
2.
3.
4.
5.

Answer 4

1 forehead
2 bridge of nose
3 nasal septum
4 primary palate
5 structures associated with medial nasal processes

Question 5

Upper face development: placodes (little circles)
*Lateral to frontonasal process

Lens placode-

Otic placode-

Nasal placode-

Answer 5

Lens- move medially to give rise to eyes

Otic- more posterior and lateral to give rise to internal ear

Nasal- anteriorly placed just superior to sternodeum, give rise to olfactory epithelium

Question 6

Upper face development: sinuses

Developing tissue-

Nasal cavity-

Conchae develop-

Answer 6

Around nasal placodes submerge the placodes and give rise to nasal cavity.

Temporarily separated from stomodeum by oronasal membrane.

Simultaneously

Question 7

Upper face development:

Medial to nasal placodes-

Lateral to nasal placodes-

Answer 7

Develop medial nasal processes. -give rise to primary palate and incisors and nasal septum.

Develop lateral nasal processes. -give rise to alae of nose -combined with maxillary and medial nasal processes give rise to nares

Question 8

Mid face development: maxillary process

Arises from the _______

Answer 8

Mandibular arch (mesenchyme and neural crest cells)

Question 9

Med face development: maxillary process

Will give rise to 
1.
2.
3.
4.
5.

Answer 9

Lateral portion of upper lip 
Cheeks (zygoma)
Secondary palate
Canines and some posterior teeth
Portions of temporal bone

Question 10

Upper and lower lip development

Maxillary processes contribute to…

Answer 10

Lateral portion of upper lip and medial nasal processes to the philtrum.

Question 11

Upper and lower lip development:

Lower lip forms…

Labial commissure formed…

Answer 11

Slightly ahead of upper lip by the mandibular arch.

By partial fusion of maxillary processes and mandibular arches