Gastrulation

Question 1

Gastrulation

Answer 1

differentiates
archenteron created
body axis created
triploblastic (3germ layers)

Question 2

Ectoderm

Answer 2

outer layer, will become skin cells
part of neurolation, becomes neural cells after induction from neural chord

Question 3

mesoderm

Answer 3

middle layer,
skeleton
muscles
made of fold between ecto and endo derm

Question 4

endoderm

Answer 4

internmost layer
gastrointestinal tract
big tube in the middle

Question 5

Archenteron

Answer 5

blastoceol becomes this after the blastopore begins to form and depression collapses into blastoceol
1st opening becomes blastopore

Question 6

blastopore

Answer 6

first opening in archenteron
endoderm cells flow over dorsal lip inside to line it

Question 7

dorsal lip

Answer 7

opening into blastopore/archenteron
animal pole cells flow over it inside

Question 8

formation of blastopore

Answer 8

blastopore forms on dorsal side
dorsal lip forms at this opening
animal pole cells roll over and into

Question 9

Involution

Answer 9

blastopore forms circle
expand endo and mesoderm internally
arche grows asn blastocoel shrinks

Question 10

yolk cells internalizes

Answer 10

blastopore plugged with yolk
RESULT
3 germ layers
archenteron
blastopore (with dorsal lip)

Question 11

involution definition

Answer 11

cell movement in which expanding outer layer turns inward and spreads over surface

Question 12

Convergent extension

Answer 12

two distinct lines of cells join to combine their length
extends archenteron

Question 13

human gatrulation

Answer 13

4 extraembryonic membranes including amnion

Question 14

Primitive streat

Answer 14

blastopore equivalent
epiblast cells move to midline, detach, and move in