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28 Cards in this Set
- Front
- Back
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gastrulation starts when
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beginning of the 3rd week, day 15
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mesenchyme
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refers to the state of the cells
undifferentiated cells not well organized: it invades a matrix |
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mesoderm
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refers to the layer
undifferentiated tissue tissue that will develop into a great variety of cells and tissues |
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What are types of tissue that the mesoderm becomes?
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connective tissue and muscle tissues AND epithelium
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mesenchyme refers to the ___
mesoderm refers to the __ |
state
layer |
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extra-embryonic mesoderm
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develops between the yolk sac epithelium (exocelomic epithelium) and cytotrophoblast late in the second week of development
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intra-embryonic mesoderm
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develops from epiblast (ectoderm) cells of the bilaminar embryo
this occurs from gastrulation and neural crest |
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as intra-embryonic mesoderm grows, it slowly displaces the _____
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extra-embryonic mesoderm
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celom
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body cavity that develops between two mesodermal layers (lined with epithelium)
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chorionic cavity
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develops by cavitation within the extraembryonic mesoderm
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chorionic cavity=
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extraembryonic celom
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yolk sac differentiates into:
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primary umbilical vesicle
secondary umbilical vesicle |
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chorion has an outer ______membrane and an inner _______ membrane
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outer somatic chorionic membrane
inner splanchnic chorionic membrane |
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day 14: chorionic cavity now isolates bilaminar embryo with its two surfaces:
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secondary umbilical vesicle
amniotic cavity |
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chorionic cavity is connected to the choriion by:
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connecting stalk
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what surface do we look at then studying the early stage of gastrulation?
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epiblastic surface
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prechordal plate
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future mouth
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early primitive streak
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at caudal end..this is where this whole process happens
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what are three features of the gastrula anatomy?
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prechordal plate
primitive node primitive streak |
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Mesoderm migrates first ____, then ___ in the embryo
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laterally
then anteriorly |
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Upon the formation of mesoderm,
epiblast becoems re-named ___ Hypoblast becomes re-named ___. |
ectoderm
endoderm |
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when notochordal reaches prechordal plate, the plate is then called _____
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oropharyngeal membrane
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Notochord arises from ___ at the ____.
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from epiblast @ primtivie node
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the notochord defines what?
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anterior-posterior axis
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What does the notochord produce?
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a gene product "sonic hedgehog" (SHH) which stimulates differentiation of spinal cord and somites
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The notochord helps create:
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left-right differences
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What is the eventual fate of the notochord?
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it mostly disappears, except for those cells that become nucleus pulposus of intervertebral disks
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did you know that the mesoderm on the left and right sides receive different inductive influences, thus creating differences between left and right sides.?
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yeah, sure, you bet cha
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