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Trilaminar Stage Test

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1.
After invagination, primitive groove cells separate from the epiblast layer and migrate into the space between what layers?
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2.
Epiblastic cells invaginate to form a narrow groove along the posterior medial line called what?
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3.
the lumen that forms in the notochordal process is called what?
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4.
the first movement of the embryonic cell populations into 3 layers is what phase?
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5.
when does the notochord degenerate?
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6.
a hollow, cartilaginous rod that extends through the midline is called what?
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7.
epiblast cells that invaginate through primitive pit extend anteriorly to form what structure?
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8.
The cells that occupy the space between the endoderm and ectoderm generate what layer of cells?
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9.
if the primitive streak cells persist, what can happen?
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10.
what direction does primitive streak grow in?
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11.
because the first cells to pass through the primitive streak reach the anterior side first, what happens?
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12.
what do anterior-bound cells that are migrating between the epiblast and hypoblast form?
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13.
what comprises the the prechordal plate?
A.
apoptosis-sclerotomes develop into vertebrae
B.
epiblast and hypoblast
C.
posterior to anterior
D.
embryos develop anterior to posterior
E.
gastrulation
F.
mesoderm
G.
sacrococcygeal teratomas
H.
notochordal canal
I.
the notochord
J.
primitive groove
K.
cardiogenic and notochord plate
L.
adherent hypoblast and epiblast cells
M.
notochordal process
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14.
the transitory channel between amniotic cavity and yolk sac is called what?
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15.
what organizes the embryogenic patterning and tissue differentiation?
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16.
some portions of notochord persist as what structure in adults?
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17.
does the notochordal plate fold anteriorly-to-posteriorly or posteriorly-to-anteriorly to become the notochord?
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18.
the once-tubular notochordal process flattens to form what?
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19.
cells that do not pass through the primitive groove become what germ layer?
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20.
the notochord is derived from what structure?
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21.
the cranial end of the primitive streak is called what? what is the caudal end called?
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22.
during regression, the notochordal process fuses with what?
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23.
cells that displace the hypoblast become what cells?

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