WVSOM Class of 2012 Trilaminar Stage
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| the first movement of the embryonic cell populations into 3 layers is what phase? | gastrulation
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| the cranial end of the primitive streak is called what? what is the caudal end called? | prechordial; cloacal
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| what organizes the embryogenic patterning and tissue differentiation? | hensen's node
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| what direction does primitive streak grow in? | posterior to anterior
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| if the primitive streak cells persist, what can happen? | sacrococcygeal teratomas
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| what do anterior-bound cells that are migrating between the epiblast and hypoblast form? | cardiogenic and notochord plate
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| because the first cells to pass through the primitive streak reach the anterior side first, what happens? | embryos develop anterior to posterior
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| a hollow, cartilaginous rod that extends through the midline is called what? | the notochord
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| when does the notochord degenerate? | apoptosis-sclerotomes develop into vertebrae
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| some portions of notochord persist as what structure in adults? | nucleus pulposis
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| epiblast cells that invaginate through primitive pit extend anteriorly to form what structure? | notochordal process
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| what comprises the the prechordal plate? | adherent hypoblast and epiblast cells
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| during regression, the notochordal process fuses with what? | the underlining endoderm
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| the transitory channel between amniotic cavity and yolk sac is called what? | the neuroenteric canal
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| the once-tubular notochordal process flattens to form what? | the notochordal plate
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| the notochordal plate folds in to become what? | the notochord
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| Epiblastic cells invaginate to form a narrow groove along the posterior medial line called what? | primitive groove
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| After invagination, primitive groove cells separate from the epiblast layer and migrate into the space between what layers? | epiblast and hypoblast
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| cells that do not pass through the primitive groove become what germ layer? | ectoderm
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| cells that displace the hypoblast become what cells? | endoderm
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| The cells that occupy the space between the endoderm and ectoderm generate what layer of cells? | mesoderm
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| the notochord is derived from what structure? | hensen's node
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| the lumen that forms in the notochordal process is called what? | notochordal canal
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| does the notochordal plate fold anteriorly-to-posteriorly or posteriorly-to-anteriorly to become the notochord? | anteriorly-to-posteriorly
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