Carnegie stage 3: Difference between revisions
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* | * '''{{mitosis}}''' - blastomere cells divide by mitosis, without growth between divisions. initially at the same time (synchronous) but with each round at slightly different times (asynchronous) | ||
* | * '''{{blastocyst}}''' - a fluid-filled cavity develops within the cell mass. | ||
Revision as of 13:30, 15 May 2018
Embryology - 21 May 2024 Expand to Translate |
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Introduction
Human blastocyst (day 5) still within zone pellucida. |
The free-floating blastocyst has reached the uterine body still enclosed in the zone pellucida and "hatches" from this surrounding extracellular matrix.
It is only after hatching that the blastocyst can attach to and then implant into the uterine wall. Summary
See also Events
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Week: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Carnegie stage: | 1 2 3 4 | 5 6 | 7 8 9 | 10 11 12 13 | 14 15 | 16 17 | 18 19 | 20 21 22 23 |
- Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline
Blastocyst Hatching
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Histiotrophic Nutrition
Term used to describe in early placenta development the intital transfer of nutrition from maternal to embryo (histiotrophic nutrition) compared to later blood-borne nutrition (hemotrophic nutrition). Histotroph is the nutritional material accumulated in spaces between the maternal and fetal tissues, derived from the maternal endometrium and the uterine glands. This nutritional material is absorbed by phagocytosis initially by blastocyst trophectoderm and then by trophoblast of the placenta. in later placental development nutrition is by the exchange of blood-borne materials between the maternal and fetal circulations, hemotrophic nutrition.
Reference
<pubmed>12050279</pubmed>
Carnegie Collection
58 cell blastocyst (day 4) (No. 8794) | 107 cell blastocyst (day 4.5) (No. 8663) |
iBook - Carnegie Embryos | |
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Events
- mitosis - blastomere cells divide by mitosis, without growth between divisions. initially at the same time (synchronous) but with each round at slightly different times (asynchronous)
- blastocyst - a fluid-filled cavity develops within the cell mass.
References
Additional Images
- Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline
Cite this page: Hill, M.A. (2024, May 21) Embryology Carnegie stage 3. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_3
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G