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Trilaminar Stage

WVSOM Class of 2012 Trilaminar Stage

QuestionAnswer
the first movement of the embryonic cell populations into 3 layers is what phase? gastrulation
the cranial end of the primitive streak is called what? what is the caudal end called? prechordial; cloacal
what organizes the embryogenic patterning and tissue differentiation? hensen's node
what direction does primitive streak grow in? posterior to anterior
if the primitive streak cells persist, what can happen? sacrococcygeal teratomas
what do anterior-bound cells that are migrating between the epiblast and hypoblast form? cardiogenic and notochord plate
because the first cells to pass through the primitive streak reach the anterior side first, what happens? embryos develop anterior to posterior
a hollow, cartilaginous rod that extends through the midline is called what? the notochord
when does the notochord degenerate? apoptosis-sclerotomes develop into vertebrae
some portions of notochord persist as what structure in adults? nucleus pulposis
epiblast cells that invaginate through primitive pit extend anteriorly to form what structure? notochordal process
what comprises the the prechordal plate? adherent hypoblast and epiblast cells
during regression, the notochordal process fuses with what? the underlining endoderm
the transitory channel between amniotic cavity and yolk sac is called what? the neuroenteric canal
the once-tubular notochordal process flattens to form what? the notochordal plate
the notochordal plate folds in to become what? the notochord
Epiblastic cells invaginate to form a narrow groove along the posterior medial line called what? primitive groove
After invagination, primitive groove cells separate from the epiblast layer and migrate into the space between what layers? epiblast and hypoblast
cells that do not pass through the primitive groove become what germ layer? ectoderm
cells that displace the hypoblast become what cells? endoderm
The cells that occupy the space between the endoderm and ectoderm generate what layer of cells? mesoderm
the notochord is derived from what structure? hensen's node
the lumen that forms in the notochordal process is called what? notochordal canal
does the notochordal plate fold anteriorly-to-posteriorly or posteriorly-to-anteriorly to become the notochord? anteriorly-to-posteriorly
Created by: mhassan on 2008-08-26



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