embryology

Question 1

pharyngeal arches 1-3 are derived from

Answer 1

neural crest

Question 2

pharyngeal arches 4 and 6 derived from

Answer 2

lateral plate

Question 3

each arch is bonded posteriorly by an ________ and a __________

Answer 3

pharyngeal cleft and pharyngeal pouch

Question 4

why do facial clefts arise?

Answer 4

failure of fusion between cleft lip and palate

Question 5

_______ ______ arise sin the junction between lateral nasal process and maxillary swelling

Answer 5

nasolacrimal groove

Question 6

placodes and neural crest cells form the

Answer 6

cranial nerves

Question 7

1st cleft forms the

Answer 7

external auditory meatus

Question 8

tongue develops from the endodermal lining of

Answer 8

arches 1, 3 and 4

Question 9

anterior 2/3 from arch and nerve

Answer 9

arch 1 and hypoglossal

Question 10

posterior 1/3 from arch and nerve

Answer 10

arch 3 and glossopharyngeal

Question 11

epiglottis from arch and nerve

Answer 11

arch 4 and vagus

Question 12

point of junction btween 1 and 3 is the

Answer 12

foramen cecum

Question 13

thyroid develops from

Answer 13

2nd arch

Question 14

Pouch 1 forms the

Answer 14

eustachian tube

Question 15

pouch 2 forms the

Answer 15

palatine tonsil

Question 16

pouch 3 forms the

Answer 16

thymus and inferior parathyroid

Question 17

pouch 4 forms the

Answer 17

superior parathyroid and C-cells

Question 18

optic cup is formed from the

Answer 18

neural tube

Question 19

sclera is formed from the

Answer 19

neural crest

Question 20

what is the signal that causes the neural tube to split?

Answer 20

sonic hedgehog

Question 21

holoprosencephaly

Answer 21

no seperation of the 2 hemispheres… no longitudinal fissure

Question 22

severe form of holoprosencephaly

Answer 22

cyclopia