Embryo

Question 1

The 1st Arch

Answer 1

Question 2

The 2nd Arch

Answer 2

Question 3

The 3rd Arch

Answer 3

Question 4

The 4th and 6th Arches

Answer 4

Question 5

1st Arch Bone Derivatives

Answer 5

Question 6

Answer 6

Question 7

Answer 7

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10

Question 11

Answer 11

Question 12

Answer 12

Question 13

Answer 13

Question 14

Answer 14

Question 15

Answer 15

Pharyngeal arch syndrome: occasionally the cartilages and other derivatives that degrade under normal developmental patterns fail, resulting in congenital abnormalities of the eyes, ears, mandible and palate, generally due to insufficient migration of neural crest cells into the arches during the 4th week

Question 16

Answer 16

Teacher-Collins syndrome: underdevelopment of the zygomatic bones including abnormalities to the external middle and inner ear.

Question 17

Answer 17

Pierre Robin sequence: general disorder including under development of the mandible, cleft palate, and defects of the eye and ear.

Question 18

Birth defects in arch arteries

Answer 18

Any number of abnormalities can develop from deviant migration or degradation of the arch arteries.