Embryology: Development of the lip and palate

Which of the following embryonic structures are not involved in the formation of the face?

• Fifth pharyngeal arch

• Frontonasal prominence

• Mandibular prominence

• Maxillary prominence

• Nasal prominence

Identify the structure marked by an arrow in the following diagram of a 5 weeks embryo.

• Frontonasal prominence

• lateral nasal prominence

• Mandibular prominence

• Maxillary prominence

• Medial nasal prominence

What embryonic structure gives rise to the primary palate?

• Frontonasal prominence

• Fused mandibular prominences

• Fused maxillary prominences

• Fused medial nasal prominences

• C and D

Which week of gestation does the formation of the upper lip begin?

• 2nd

• 4th

• 6th

• 8th

• 10th

Fusion of which structures form the secondary palate?

• Both palatine shelves

• Maxillary processes on the two sides

• Palatine shelves with each other and nasal septum

• Palatine shelves with each other and with primary palate and nasal septum

• Palatine shelves with primary palate

What gestation age does the formation of the secondary palate begin?

• 3rd week

• 4th week

• 5th week

• 6th week

• 7th week

What structures form the philtrum?

• Fusion of the frontonasal with maxillary prominences

• Fusion of the lateral nasal and maxillary prominence

• Fusion of the maxillary prominences

• Fusion of the maxillary with the mandibular prominences

• Fusion of the medial nasal and maxillary prominence

What structure forms the sides of the nose?

• Frontonasal prominence

• Lateral nasal prominence

• Mandibular prominence

• Maxillary prominence

• Medial nasal prominence

What approximate gestation age is lip formation completed?

• 6th week

• 7th week

• 8th week

• 9th week

• 10th week

What approximate gestation age is palate formation completed?

• 8th week

• 9th week

• 10th week

• 11th week

• 12th week