File:Stage7 bf5.jpg: Difference between revisions

Revision as of 13:23, 5 September 2011

Human Embryo Stage 7

Appearance of section looks to be about a Carnegie stage 7 embryo.

Image Links: Original full image | Trilaminar embryo excerpt

Image version links: ExtraLarge 1712x1206px | Large 1024x721px | Medium 500x352px | Small 240x169px

Human Embryo Stage 7 Information

Carnegie stage 7

Features: embryonic disc, primitive node, primative streak, primitive groove, yolk sac

Facts: Week 3, 15 - 17 days, 0.4 mm

View 1: embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side.

Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm.

Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the buccopharyngeal and cloacal membranes. These membranes have ectoderm and endoderm only and will lie at the rostral (head) and caudal (tail) of the gastrointestinal tract.

Reference

Original Author Legend - Primitive Trilaminar Human Embryo in Tubal Pregnancy (40X)

"I think this is at about the same developmental stage as the Hertig-Rock embryo of 1945, which has been variously estimated at 16.5 or 19 days postovulation (4 to 5 weeks by conventional obstetrical dating, counting from the first day of the last menstrual period)."

Original file name: 3944578509_bd228ca576_o.jpg

http://www.flickr.com/photos/euthman/3944578509/

Uploaded to Flickr on September 22, 2009 by Ed Uthman Image (pathologist in Houston, Texas)

http://creativecommons.org/licenses/by/2.0/

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:43, 21 July 2010		1,712 × 1,206 (875 KB)	S8600021 (talk \| contribs)	==Human embryo - 3 week== Appearance of section looks to be about a Carnegie stage 7 embryo. Original Author Legend - Primitive Trilaminar Human Embryo in Tubal Pregnancy (40X) :"I think this is at about the same developmental stage as the Hertig-Roc

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Camera manufacturer	NIKON
Camera model	E995
Exposure time	5/1,587 sec (0.0031505986137366)
F Number	f/4.2
ISO speed rating	100
Date and time of data generation	12:26, 22 September 2009
Lens focal length	8.2 mm
Orientation	0
Horizontal resolution	300 dpi
Vertical resolution	300 dpi
Software used	Picasa 3.0
File change date and time	12:26, 22 September 2009
Y and C positioning	Co-sited
Exposure Programme	Normal programme
Exif version	2.1
Date and time of digitising	12:26, 22 September 2009
Meaning of each component	Y Cb Cr does not exist
Image compression mode	4
APEX exposure bias	0.7
Maximum land aperture	0 APEX (f/1)
Metering mode	Pattern
Light source	Unknown
Flash	Flash did not fire
Supported Flashpix version	1
Colour space	Uncalibrated
File source	Digital still camera
Scene type	A directly photographed image
Unique image ID	50598a4a1588e99108cec44cb34f435e

@@ Line 1: / Line 1: @@
-==Human embryo - 3 week==
+==Human Embryo Stage 7==
 Appearance of section looks to be about a [[Carnegie stage 7]] embryo.
-Original Author Legend - Primitive Trilaminar Human Embryo in Tubal Pregnancy (40X)
+:'''Image Links:''' [[:File:Stage7 bf5.jpg|Original full image]] | [[:File:Stage7 bf51.jpg|Trilaminar embryo excerpt]]
-:"I think this is at about the same developmental stage as the Hertig-Rock embryo of 1945, which has been variously estimated at 16.5 or 19 days postovulation (4 to 5 weeks by conventional obstetrical dating, counting from the first day of the last menstrual period)."
-Original file name: 3944578509_bd228ca576_o.jpg
-http://www.flickr.com/photos/euthman/3944578509/
-Uploaded to Flickr on September 22, 2009 by Ed Uthman Image (pathologist in Houston, Texas)
-http://creativecommons.org/licenses/by/2.0/
-'''Image version links:''' [[:File:Stage7 bf5.jpg|ExtraLarge 1712x1206px]] | [[:File:Stage7 bf5a.jpg|Large 1024x721px]] | [[:File:Stage7 bf5b.jpg|Medium 500x352px]] | [[:File:Stage7 bf5c.jpg|Small 240x169px]]
+:'''Image version links:''' [[:File:Stage7 bf5.jpg|ExtraLarge 1712x1206px]] | [[:File:Stage7 bf5a.jpg|Large 1024x721px]] | [[:File:Stage7 bf5b.jpg|Medium 500x352px]] | [[:File:Stage7 bf5c.jpg|Small 240x169px]]
-== Human Embryo Stage 7 Information==
+=== Human Embryo Stage 7 Information===
 Carnegie stage 7
@@ Line 28: / Line 20: @@
 Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the buccopharyngeal and cloacal membranes. These membranes have ectoderm and endoderm only and will lie at the rostral (head) and caudal (tail) of the gastrointestinal tract.
+===Reference===
+Original Author Legend - Primitive Trilaminar Human Embryo in Tubal Pregnancy (40X)
+:"I think this is at about the same developmental stage as the Hertig-Rock embryo of 1945, which has been variously estimated at 16.5 or 19 days postovulation (4 to 5 weeks by conventional obstetrical dating, counting from the first day of the last menstrual period)."
+Original file name: 3944578509_bd228ca576_o.jpg
+http://www.flickr.com/photos/euthman/3944578509/
+Uploaded to Flickr on September 22, 2009 by Ed Uthman Image (pathologist in Houston, Texas)
+http://creativecommons.org/licenses/by/2.0/
 [[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Carnegie Stage 7]] [[Category:Week 3]] [[Category:Gastrulation]] [[Category:Ectopic Pregnancy]]