UNIT 3 - Face and nasal cavity development

When is the face and nasal cavity formed ?

By the end of the 4th week and beginning of the 5th week

How is the face formed ?

From the neural crest of the ectoderm which gives rise to 5 prominences that develop into the face (fronto-nasal, maxillary and mandibular prominences)

Which of the 5 prominences that develop into the face, come from pharyngeal arches ?

• 2 maxillary prominences

• 2 mandibular prominences

How is the nasal cavity formed ?

From ectodermal nasal placodes (4th week)

Which prominences do nasal placodes give rise to ?

• lateral nasal prominence

• medial nasal prominence

What will intermaxillary segment will develops ?

Palate

What does the fusion of medial nasal, lateral nasal and maxillary prominences result in ?

Formation of inter-maxillary segment

When are the cheeks and upper jaw developing ?

6-8 weeks

How are formed cheeks and upper jaw ?

Fusion of :

• maxillary prominence

• lateral nasal prominence

How is naso-lacrimal groove formed ?

junction of :

• maxillary prominence

• lateral nasal prominence

When is the upper lip developed ?

6-8 weeks

How is the upper lip formed ?

Fusion of :

• maxillary prominence

• medial nasal prominence

When are formed lower lip and mandible ?

6-8 weeks

How are formed lower lip and mandible ?

Development and fusion of mandibular prominences

When is the nose formed ?

6-8 weeks

How is the nose formed ?

Fusion of :

• lateral nasal prominence

• medial nasal prominence

• frontonasal prominence

What does frontonasal prominence form ?

• Forehead

• Nose

What is developing forehead ?

Frontonasal prominence

What does maxillary prominence form ?

• cheeks

• upper lip

• upper jaw

What does mandibular prominence form ?

• lower lip

• mandible (lower jaw)

What does lateral nasal prominence form ?

• cheeks

• nose

• upper jaw

What does medial nasal prominence form ?

• nose

• upper lip