Face and Palate Development

Question 1

what age does the face start to develop?

Answer 1

4-8 weeks in uterus

Question 2

when does the palate start to develop?

Answer 2

approximately 6-10 weeks in uterus (soft palate can take up to 12)

Question 3

what is the earliest bone laid down in the skull and when is it laid?

Answer 3

mandible 6/7 weeks

Question 4

what stems from the first pharyngeal arch?

Answer 4

trigeminal nerve, muscles of mastication, malleus, incus, meckels cartilage

Question 5

what are the 5 prominences?

Answer 5

frontonasal, medial nasal and lateral nasal, maxillary and mandibular

Question 6

what does the frontonasal prominence form?

Answer 6

forehead and bridge of nose

Question 7

what does the medial nasal prominence form?

Answer 7

midline nose, philtrum upper lip, primary palate

Question 8

what does the lateral nasal prominence form?

Answer 8

alae of nose

Question 9

what does the maxillary prominence form?

Answer 9

cheeks, lateral upper lip, secondary palate

Question 10

what does the mandibular prominence form?

Answer 10

lower lip and jaw

Question 11

how and when do the nasal and oral cavities separate?

Answer 11

separated during 7th and 8th week by palatal shelves. Palatal shelves grow downwards and then rotate up towards the midline to a horizontal position where they fuse together to form a secondary palate. Secondary palate fuses with the primary palate at the incisive foramen and bone is then laid down

Question 12

what sex is cleft palate more common in?

Answer 12

females

Question 13

what sex is cleft lip more common in?

Answer 13

males