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MAMS COT > Quiz 3 > Flashcards

Quiz 3 Flashcards

1
Q

Oropharyngeal

A

Oral

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2
Q

Cloacal

A

Anal

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3
Q

Body folding starts in week

A

4

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4
Q

Cranial neuropore closes (day/stage)

A

Day 25, Stage 11

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5
Q

Caudal neuropore closes (day/stage)

A

Day 28, Stage 12

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6
Q

Which week is the herniation of intestines?

A

Weeks 5-6

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7
Q

Oriented cell divison

A

Cells divide vertically

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8
Q

Oriented cell migration

A

Cells migrate in one direction

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9
Q

Convergent extension

A

Group of 4 cells –> converge to from a line

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10
Q

3 methods of embryonic lengthening

A

1) Oriented cell division
2) Oriented cell migration
3) Convergent extension

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11
Q

Neuroectoderm

A
  • Induced from surface ectoderm by notochord
  • begins as neural plate
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12
Q

Notochord: endo, meso or ectoderm?

A

Mesoderm

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13
Q

Neurulation steps

A

1) induction of neural plate folding
2) folds begint o converge
3) fusion of neural folds
4) NCC undergo EMT to ectomesenchyme
5) Cranial neuropore closes day 25
6) Caudal neuropore closes day 28

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14
Q

NCC

A
  • arise from NCC
  • dorsal migration: NCC reenter ectoderm via foles in basal lamina to form melanocytes
  • ventral migration: become peripheral ganglia via anterior half of each somite
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15
Q

Surface ectoderm

A

completely surrounds embryo, becomes skin

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16
Q

Stomoderm

A

Mouth: Meets endoderm to from oropharyngeal membrane (no mesoderm)

17
Q

Proctoderm

A

Anus: Meets endoderm to form cloacal membrane (no mesoderm)

18
Q

Paraxial Mesoderm

A

Condenses into somites, cranial to caudal

19
Q

Somite differentiation tree

A

Somites
Dermamyotome, Sclerotome
Dermatome, Myotome, Sclerotome

20
Q

Intermediate mesoderm

A

forms gonads and kidneys (temporarily connects lateral and paraxial mesoderm)

21
Q

How are the mesodermic layers oriented?

A

Notochord –> Paraxial mesoderm –> intermediate mesoderm –> Lateral plate mesoderm (splits into somatic-upper and splanchnic-lower)

22
Q

What do the later plate layers become?

A

Under MET to become mesothelia
somatic - body cavity lining
splanchnic - organ lining

23
Q

Endoderm

A

Lines gut tube

24
Q

Why does intestinal herniation occur?

A

Intestines elongate faster than gut tube expands, causing them to herniate through umbilical ring

25
Q

What do the intestines rotate 90º around?

A

Superior mesenteric artery

(will later rotate another 180º, total 270º)

26
Q

Umbilical hernia

A

protrusion through umbilical ring covered by skin

27
Q

Omphalocele

A

Protrusion, failure of intestinal return

28
Q

Gastroschisis

A

failure of anterior wall to close properly (separate from umbilical ring)

MAMS COT (5 decks)

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