facial development

Question 1

what happens to the face at the 5th week

Answer 1

the maxillary process fuses with the medial nasal process on each side to complete the formation of the UPPER LIP!
has to fuse by early 6th week

Question 2

whats the intermaxillary segment

Answer 2

fusion of the two medial nasal processes

Question 3

what happens in the 6th week to the face

Answer 3

early 6th week= intermaxillary segment is formed by fdusion of the medial nasal processes (incisor alveolar processes and primary palate)

Question 4

whats the membrane at base of nasal pit and oral cavity

and what is it called when it breaks down

Answer 4

oronasal membrane  (splits nose area from oral cavity) 
broken down/space-- primary choanae or primitive choana (becomes definitive choana)

Question 5

when do palatal shelves originate and grow down, when does growth continue until

Answer 5

they originate and grow down from maxillry processes in 7th and 8th weeks
vertical growth continues and completes around the third month of gestation!!

(8th week, palatal shelf elevation)

Question 6

when does secondary palate form and how do shelves contribute/when

Answer 6

secondary palate formation, palatal shelf ELEVATION occurs in 7th and 8th weeks

tongue goes down and shelves go up.
in the 9th-12th weeks, its formed /nasal septum connects to the palatal shelves , and the palatal shelves have FUSED at midline – epithelial seam!!!