Talk:Human embryonic development

Untitled
Stages like blastula gastrula are not described.

Series on Human Growth and Development
This should be part of the series on Human Growth and Development instead of the generic Embryo article. Does anyone know how to insert the template box into the article? Template:Human growth and development MartianCat —Preceding undated comment added 06:59, 21 February 2016 (UTC)

Pictures
I think this is a pretty important article and has not received the attention it deserves. Pictures in particular will most definitely enhance the quality of the article (especially timeline pictures displaying the stages of human embryogenesis). —Preceding unsigned comment added by Medsta (talk • contribs) 15:06, 22 June 2008 (UTC)


 * There are now new and better pictures to at least week 9:
 * https://www.theguardian.com/world/2022/oct/18/pregnancy-weeks-abortion-tissue
 * https://myanetwork.org/the-issue-of-tissue/ 96.42.204.213 (talk) 06:41, 23 January 2023 (UTC)

Try to be more clinical, please
Words such as "masterpiece" and "spectacular" are not really appropriate.Krychek (talk) 13:06, 10 December 2010 (UTC)

I agree. I am going to change this unless someone can offer a better alternative. 71.199.220.76 (talk) 22:48, 12 June 2011 (UTC)

First weeks of life
Introduction claims that we usually spend the first weeks "of life" (in utero). Doesn't this require agreement that life begins at implantation? Since this is clearly controversial, I suggest it simply be removed, instead we say Humans spend the first weeks (in utero). Also, I recently came across material that puts it at 39 weeks. 7 days seems to be too large to be ignored, which is correct?173.189.76.237 (talk) 20:03, 18 August 2013 (UTC)

Merge with "Embryo development of the first month" Discussion
I do not agree that Human embryogenesis should be merged with (generic) embryo development. Certainly there are similarities between say an embryo of fern and a human, but there is little reason to group them together. In my ignorance, I would also ask if a fixed time period is a reasonable way to speak about generic development; isn't timing species dependent? Is one month of algae development equivalent to 1 month of say development in the grey whale or African elephant? But more specifically, the people interested in Human development are just not, in my opinion, going to be the same group that are interested in generic embryogenesis across species (and kingdoms).173.189.76.237 (talk) 20:29, 18 August 2013 (UTC)

I agree with proposed merge but Embryo development of the first month needs a 'human' tag. By referring to the first month would seem to indicate reference to human embryo anyway. There is very little in Human embryogenesis that actually refers to the development of the embryo -it is taken up with description of the germinal stage. Also think there is a lot of duplication of material - as in prenatal development. As there is so much that could be included in the 'germinal stage' and so much more that could be included in the 'embryo stage' perhaps these could be separated at a later date.? Iztwoz (talk) 08:19, 24 December 2013 (UTC)

The objection raised is not referring to the mentioned article - in Embryo development of first month there is no mention anywhere of any other species. Since there has been no valid objection raised and sInce there has also been much work done on Human Embryogenesis I intend to go ahead with the merge as there now is complete overlap and duplication.Iztwoz (talk) 21:37, 29 March 2014 (UTC)

Serious Problems with opening two paragraphs
Here's how it looked when I found it.


 * "Human embryology is the study of human development during the first eight weeks from gametogenesis (sperm and oocyte development) through fertilization (fusion of sperm and oocyte) up to 8 weeks after implantation of the zygote (fertilized egg) into the uterus. After the 8th week of implantation, the developing embryo becomes a fetus. Most humans spend the first nine months (38 weeks or 266 days) of life within the uterus of the mother.
 * Human embryogenesis is the process of cell division and cellular differentiation of the human embryo that occurs during early stages of development. From a biological standpoint, human development is a continuum, starting with the germ cells (ovum and spermatozoon), through fertilization, prenatal development, and growth through adulthood. The germinal stage, refers to ovum (egg) prior to fertilization, through the development of the early embryo, up until the time of implantation.[1]" Reference: Gilbert, Scott F. (2003). "Prenatal Development". Human Development (9th ed.). New York, NY: McGraw Hill College. ISBN 978-0072820300

ERRORS

 * Human embryology is the study of human development during the first eight weeks from gametogenesis (sperm and oocyte development) through fertilization. - Embryology is the science of the development of an embryo from the fertilization of the ovum to the fetus stage. The embryonic period lasts 8 weeks. The fetal stage begins at the start of the 9th week.
 * up to 8 weeks after implantation. - it's after fertilization
 * implantation of the zygote (fertilized egg) into the uterus. - it's an embryo not a zygote at implantation
 * After the 8th week of implantation, the developing embryo becomes a fetus. - it's 8th week after fertilization.
 * From a biological standpoint, human development is a continuum, starting with the germ cells (ovum and spermatozoon), through fertilization, prenatal development, and growth through adulthood. - Numerous uses of this sentence were found, but all referred back to this article. I found an almost identical statement, but with very different meaning, which I believe is likely the source: "Human development: 1) Human development is the process of growing to maturity. In biological terms this entails growth from a one celled zygote to an adult human being. 2) Biological development 3) From a philosophical perspective human development is a continuum, starting with the germ cells (ovum and spermatozoon), through fertilization, prenatal development, birth, and growth to adulthood." from Study Guide for: Anthropology and Contemporary Human Problems by John H. Bodley, ISBN 9780759121584
 * The germinal stage, refers to ovum (egg) prior to fertilization, through the development of the early embryo, up until the time of implantation. - Fertilization occurs when the sperm successfully enters the ovum's membrane. The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences.
 * Reference: Gilbert, Scott F. (2003). "Prenatal Development". Human Development (9th ed.). New York, NY: McGraw Hill College. ISBN 978-0072820300. - This reference doesn't exist. The ISBN # refers to: Human development by Diane E Papalia; Sally Wendkos Olds; Ruth Duskin Feldman. There's no chapter called Prenatal Development and Scott Gilbert isn't a contributor. There is a book: Developmental Biology, by Scott F. Gilbert & Susan Singer. The ISBN is 978-0878932504. It doesn't contain either of the two above quotes (ie, "From a biological standpoint..." or "The germinal stage refers to ovum...") Ock Raz   talk  07:09, 6 October 2013 (UTC)

Neural tube
Why is there no reference to this major feature of embryogenesis? Iztwoz (talk) 08:31, 24 December 2013 (UTC)

Errors in pictures?
IIRC, the zygote takes 12-24 hours to divide each time, therefore in the first picture there are far too many cells in the second and even third day details.

The picture "embryo attached to placenta" has some labelling errors.

Lucy Skywalker (talk) 22:53, 21 May 2014 (UTC)

comparison with animal embryogenesis
This would be good to have a mention, particularly to compare times involved eg the very slow rate of human zygote division AFAICT, if you can source good info on this topic. It looks as if mistakes abound eg above note on the picture inaccuracy & I have found errors mentioned elsewhere.

Lucy Skywalker (talk) 22:59, 21 May 2014 (UTC)

gastrulation
The link here is misleading because the gastrulation article refers to animals: the gastrula picture there is nothing like the human gastrula which has ectoderm with amniotic cavity "above" future mesoderm and endoderm with yolk sac "below", all at first free floating, then attached via ectoderm initially.

Lucy Skywalker (talk) 23:13, 21 May 2014 (UTC)

black and white photo problem
There is a black and white photo of an "8-cell embryo, at 3 days". There is no scale reference or description of the amount of magnification.--Mark v1.0 (talk) 12:13, 14 December 2016 (UTC)

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Mistake in picture
There seems to be a mistake in the picture 0f development day by day (file:HumanEmbryogenesis.svg). At day 7 impantation/nidation is shown in the picture, but at day 9 nidation still has to be done. Also at day 18 it looks like if mesoderm is everywhere surrounding endoderm as wel as actoderm. This can.t be right, because it is the middle layer. Does someone agree with these observations? MPhernambucq (talk) 16:56, 13 November 2023 (UTC)