File:Human embryo day 18.jpg - Revision history

Z8600021: Z8600021 uploaded a new version of File:Human embryo day 18.jpg

2015-10-08T11:48:53Z

Z8600021 uploaded a new version of File:Human embryo day 18.jpg

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Revision as of 22:48, 8 October 2015

Z8600021: /* Human Embryo (day 18) */

2015-10-08T11:47:42Z

Human Embryo (day 18)

← Older revision		Revision as of 22:47, 8 October 2015
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	Identify the		Identify the
	* 3 cavities: yolk sac, amniotic sac and chorionic sac.		* 3 cavities - yolk sac, amniotic sac and chorionic sac.
	* 3 layers of the trilaminar embryo: ectoderm (columnar cells), intraembryonic mesoderm (mesenchymal cells, endodermal cells (cuboidal single layer).		* 3 layers of the trilaminar embryo - ectoderm (columnar cells), intraembryonic mesoderm (mesenchymal cells, endodermal cells (cuboidal single layer).
	* extraembryonic mesoderm which surrounds the yolk and amniotic sacs, and continues to form the connecting stalk, where it then continues to line the chorionic sac. Extra- and intra-embryonic mesoderm merge along the perimeter of the embryonic disc.		* extraembryonic mesoderm which surrounds the yolk and amniotic sacs, and continues to form the connecting stalk, where it then continues to line the chorionic sac. Extra- and intra-embryonic mesoderm merge along the perimeter of the embryonic disc.
	* primitive groove with dense cluster of primitive streak cells below it.		* primitive groove with dense cluster of primitive streak cells below it.

Z8600021 at 11:47, 8 October 2015

2015-10-08T11:47:08Z

← Older revision		Revision as of 22:47, 8 October 2015
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	Approximate cross-section of a different, 18 day human conceptus [[Carnegie stage 6]]).		Approximate cross-section of a different, 18 day human conceptus ([[Carnegie stage 6]]).

	Identify the		Identify the
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	At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).		At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).


			:'''Links:''' [[Carnegie stage 6]]

	===Reference===		===Reference===

Z8600021 at 11:46, 8 October 2015

2015-10-08T11:46:33Z

← Older revision		Revision as of 22:46, 8 October 2015
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	Approximate cross-section of a different, 18 day human conceptus.		Approximate cross-section of a different, 18 day human conceptus [[Carnegie stage 6]]).

	Identify the 3 cavities: yolk sac, amniotic sac and chorionic sac.		Identify the
			* 3 cavities: yolk sac, amniotic sac and chorionic sac.
	~~Identify the~~ 3 layers of the trilaminar embryo: ectoderm (columnar cells), intraembryonic mesoderm (mesenchymal cells, endodermal cells (cuboidal single layer).		* 3 layers of the trilaminar embryo: ectoderm (columnar cells), intraembryonic mesoderm (mesenchymal cells, endodermal cells (cuboidal single layer).
			* extraembryonic mesoderm which surrounds the yolk and amniotic sacs, and continues to form the connecting stalk, where it then continues to line the chorionic sac. Extra- and intra-embryonic mesoderm merge along the perimeter of the embryonic disc.
	~~Identify the~~ extraembryonic mesoderm which surrounds the yolk and amniotic sacs, and continues to form the connecting stalk, where it then continues to line the chorionic sac. Extra- and intra-embryonic mesoderm merge along the perimeter of the embryonic disc.		* primitive groove with dense cluster of primitive streak cells below it.

	~~Identify~~ primitive groove with dense cluster of primitive streak cells below it.

	At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).		At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).
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	{{Footer}}		{{Footer}}

	[[Category:Week 3]]		[[Category:Week 3]][[Category:Carnegie Stage 6]]

Z8600021 at 11:43, 8 October 2015

2015-10-08T11:43:47Z

← Older revision		Revision as of 22:43, 8 October 2015
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	Human ~~embryo~~ day 18		==Human Embryo (day 18)==


	Approximate cross-section of a different, 18 day human conceptus.		Approximate cross-section of a different, 18 day human conceptus.
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	At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).		At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).

	~~(Image:~~ Nishimura etal., 1977)		===Reference===

			Nishimura etal., 1977

			{{Footer}}

	[[Category:Week 3]]		[[Category:Week 3]]

S8600021 at 10:38, 9 Mayıs 2010

2010-05-09T10:38:42Z

← Older revision		Revision as of 21:38, 9 Mayıs 2010
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	Human embryo day 18		Human embryo day 18

			Approximate cross-section of a different, 18 day human conceptus.

			Identify the 3 cavities: yolk sac, amniotic sac and chorionic sac.

			Identify the 3 layers of the trilaminar embryo: ectoderm (columnar cells), intraembryonic mesoderm (mesenchymal cells, endodermal cells (cuboidal single layer).

			Identify the extraembryonic mesoderm which surrounds the yolk and amniotic sacs, and continues to form the connecting stalk, where it then continues to line the chorionic sac. Extra- and intra-embryonic mesoderm merge along the perimeter of the embryonic disc.

			Identify primitive groove with dense cluster of primitive streak cells below it.

			At the top right of the micrograph is a secondary chorionic villus, lying in an empty maternal intervillus space. The villous has an outer layer of syncytiotrophoblast (smaller, darker nuclei), an intermediate layer of cytotrophoblast and a core of mesoblast (extra-embryonic mesoderm).

			(Image: Nishimura etal., 1977)


	[[Category:Week 3]]		[[Category:Week 3]]

S8600021: Human embryo day 18 Category:Week 3

2010-05-09T10:38:04Z

Human embryo day 18 Category:Week 3

New page

Human embryo day 18

[[Category:Week 3]]