embryology Flashcards

1
Q

pharyngeal arches 1-3 are derived from

A

neural crest

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2
Q

pharyngeal arches 4 and 6 derived from

A

lateral plate

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3
Q

each arch is bonded posteriorly by an ________ and a __________

A

pharyngeal cleft and pharyngeal pouch

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4
Q

why do facial clefts arise?

A

failure of fusion between cleft lip and palate

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5
Q

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

A

nasolacrimal groove

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6
Q

placodes and neural crest cells form the

A

cranial nerves

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7
Q

1st cleft forms the

A

external auditory meatus

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8
Q

tongue develops from the endodermal lining of

A

arches 1, 3 and 4

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9
Q

anterior 2/3 from arch and nerve

A

arch 1 and hypoglossal

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10
Q

posterior 1/3 from arch and nerve

A

arch 3 and glossopharyngeal

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11
Q

epiglottis from arch and nerve

A

arch 4 and vagus

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12
Q

point of junction btween 1 and 3 is the

A

foramen cecum

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13
Q

thyroid develops from

A

2nd arch

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14
Q

Pouch 1 forms the

A

eustachian tube

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15
Q

pouch 2 forms the

A

palatine tonsil

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16
Q

pouch 3 forms the

A

thymus and inferior parathyroid

17
Q

pouch 4 forms the

A

superior parathyroid and C-cells

18
Q

optic cup is formed from the

A

neural tube

19
Q

sclera is formed from the

A

neural crest

20
Q

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

A

sonic hedgehog

21
Q

holoprosencephaly

A

no seperation of the 2 hemispheres… no longitudinal fissure

22
Q

severe form of holoprosencephaly

A

cyclopia