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the first movement of the embryonic cell populations into 3 layers is what phase?
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the cranial end of the primitive streak is called what? what is the caudal end called?
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Trilaminar Stage
WVSOM Class of 2012 Trilaminar Stage
| Question | Answer |
|---|---|
| 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
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