Term
| The wall of the Blastocyst consists of a single layer of _______ cells and an inner cell mass the ________ . |
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Definition
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Term
| What is responsible for the attachment of the blastocyst to the uterine epithelium and the implantation into the endometrium? |
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Definition
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Term
With implantation the cells of the trophoblast divide into what two layers?
And what will these layers form? |
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Definition
Cytotrophoblast and a Syncytiotrophoblast
They will form the embryonic membrane and the fetal portion of the placenta. |
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Term
| The inner cell mass is also called the_____and gives rise to the_____. |
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Definition
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Term
The inner cell mass (embryoblast) divides into what 2 layers?
What do they form? |
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Definition
The inner layer the entoderm outer layer the ectoderm
These 2 layers form the embryonic disc
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Term
| After the 2 layers have formed a space appears between the inner cell mass and the trophoblast layer to form |
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Definition
The amniotic cavity
(which is lined by ectodermal and aminogenic cells) |
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Term
The primative yolk sac is formed by what cells? |
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Definition
Migrating entodermal cells |
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Term
The entodermal cells are then separated from the trophoblast by?
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Definition
The extra embryonic mesoderm |
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Term
The embryonic proper is now a disc made up of 2 layers of cells which gives rise to? |
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Definition
Formation of all the intra embryonic tissues |
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Term
Ectodermal cells
migrate between the ectoderm and entoderm
which now gives rise to the? |
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Definition
Intraembryonic mesoderm the (3rd layer) |
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Term
The prochordal plate is the at the superior portion of the embryonic disc where____.
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Definition
the entoderm has thickened
(There is no mesoderm between the ectoderm and the entoderm at the level of the precordial plate) |
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Term
| With the formation of the celom , the mesoderm has been separated into 2 layers? |
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Definition
| a parietal or somatopleuric mesoderm and the splanchnopleuric mesoderm |
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Term
| In the mesenchyme of the splanchnopleuric mesoderm there are masses of angiogenic cells. The angiogenic cells give rise to what? |
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Definition
The angiogenic cell clusters or blood islands rapidly increase in number and size from the growth of these vessels the endocardial tubes will grow |
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Term
Bilaterally ,clusters of angiogenic cells have formed and will produce _________, these vessels connect to the __________________.
At the caudel end the venous end the endocardial tubes will join the __________from the yolk sac and later with the ___________. |
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Definition
2 dorsal aorta’s
arterial end of the endocardial tubes
vitelline veins
umbilical veins |
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Term
| With the formation of the 2 Dorsal Aortas these vessels will connect with the ________ forming what end? |
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Definition
dorsal-caudal end of the endocardial tubes
forming an arterial end |
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Term
| The caudal ends of the lateral endocardial tubes will eventually fuse with the __________. What end of the heart does this form? |
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Definition
vitelline veins
forming the venous end of the heart
(which is still outside the pericardial cavity) |
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Term
| The rapid growth of the forebrain along with the neural plate causes changes to what? |
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Definition
The positioning of the cardiac area, aligning the R&L endocardial tubes closer
(The Communications between the L/R Heart tubes fuse resulting in a single Heart Tube with an arterial end and venous end) |
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Term
| With the formation of the Heart Tube ,the Dorsal Aorta’s are positioned _________with each Aorta producian Arch , R/L Aortic Arches. |
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Definition
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Term
| The Heart beats at ____ days and circulation begins at ______days. |
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Definition
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Term
With the formation of a single Heart tube , the splanchnopleuric mesodermal tissue surrounding the endocardial heart tube has split into 3 different layers.
Describe these layers: |
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Definition
The cardiac jelly is the inner layer around the endothilium
(around the heart tube )
The second layer is densely nucleated and
The third layer is the outer layer which consists of mesothelial cells which lines the pericardial cavity. ( these second and third layers are called the myoepicardium ) Also called the myoepicardium mantle
(The embryo at this point is 7 somites and 23 days old) |
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