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Embryology is the study of the development of an embryo. An embryo is defined as any organism in a stage before birth or hatching, or in plants, before germination occurs.

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Wikipedia about embryology

Embryology is the study of the development of an embryo. An embryo is defined as any organism in a stage before birth or hatching, or in plants, before germination occurs.

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Embryology refers to the development of the fertilized egg cell (zygote) and its differentiation into tissues and organs. After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end.

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In animals, the blastula develops in one of two ways that divides the whole animal kingdom into two halves. If in the blastula the first pore (blastopore) becomes the mouth of the animal, it is a protostome; if the first pore becomes the anus then it is a deuterostome. The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes includes more advanced animals including the vertebrates. In due course, the blastula changes into a more differentiated structure called the gastrula.

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The gastrula with its blastopore soon develops three distinct layers of cells (the germ layers) from which all the bodily organs and tissues then develop:

  • The innermost layer, or endoderm, gives rise to the digestive organs, lungs and bladder.
  • The middle layer, or mesoderm, gives rise to the muscles, skeleton and blood system.
  • The outer layer of cells, or ectoderm, gives rise to the nervous system and skin.

In humans, the term embryo refers to the ball of dividing cells from the moment the zygote implants itself in the uterus wall until the end of the eighth week after conception. Beyond the eighth week, the developing human is then called a fetus. Embryos in many species often appear similar to one another in early developmental stages. The reason for this similarity is because species have a shared evolutionary history. These similarities among species are called homologous structures, which are structures that have the same or similar function and mechanism having evolved from a common ancestor.

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History

As recently as the 18th century, the prevailing notion in human embryology was preformation: the idea that the egg or sperm contains an embryo--a preformed, miniature infant, or "homunculus"--that simply becomes larger during development. The competing explanation of embryonic development was epigenesis, originally proposed 2,000 years earlier by Aristotle. According to epigenesis, the form of an animal emerges gradually from a relatively formless egg. As microscopy improved during the 19th century, biologists could see that embryos took shape in a series of progressive steps, and epigenesis displaced preformation as the favored explanation among embryologists.

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Chickscope 1.5: Explore: Embryology

Embryology: The 21-day Chick Lifecycle. How does an egg develop from the time it ... Come explore with us the fascinating 21-day life cycle of the ...chickscope.beckman.uiuc.edu/explore/embryology/

Embryology, Basic Sciences - Books | Target.com

Buy Embryology Books and other related products at Target.comwww.target.com/Embryology-Basic-Sciences-Medical-Books/b?ie=...

embryology - Definition from the Merriam-Webster Online Dictionary

Definition of embryology from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.www.merriam-webster.com/dictionary/embryology

Embryology - MSN Encarta

Embryology, branch of biology dealing with the development of the animal embryo. ... Embryology - Wikipedia, the free encyclopedia ... The Human Embryology Website ...encarta.msn.com/encyclopedia_761566073/Embryology.html

BERP: Basic Embryology Review Program

Follows development from fertilization through birth. ... Penn's Embryology program has been selected for inclusion in two well-known " ...www.med.upenn.edu/meded/public/berp/

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News about Embryology

Fertility doctor 'failed patient'

BBC NewsOne of the UK's leading IVF doctors dismissed a patient's fears over her health only for her to end up in intensive care, a GMC hearing is told.http://news.bbc.co.uk/go/rss/-/1/hi/health/7645635.stm

IVF doctor: Patients view him with awe but rivals are less impressed

Independent He is Britain's most successful IVF doctor with a live birth rate twice the national average and a fortune founded on enabling women to have children, sometimes after years of fruitless treatment in other clinics. http://www.independent.co.uk/life-style/health-and-wellbeing...

IVF expert accused of dismissing sick patient

Guardian UnlimitedFertility doctor failed to investigate when woman complained of vomiting, calling it a 'mental block'http://www.guardian.co.uk/society/2008/oct/01/health.women

Sick woman 'rushed to intensive care after fertility guru Taranissi failed to investigate condition'

Daily MailA female patient of the UK’s most successful fertility doctor was rushed to intensive care after he failed to investigate why the woman was vomiting when she attended his clinichttp://www.dailymail.co.uk/news/article-1065129/Sick-woman-r...

IVF doctor faces disciplinary hearing

The HeraldA disciplinary hearing against Britain's most successful IVF doctor was adjourned yesterday. Mohamed Taranissi faces the General Medical Council (GMC) over allegations relating to the treatment of two female patients at his London clinic.http://www.theherald.co.uk/news/other/display.var.2454577.0....

News about Embryology

Scottish Catholic leader urges public to vote in Glenrothes by ...

Daily TelegraphHe also bemoans the "depressing reality" that 40 years after it was passed the Abortion Act has not been repealed or amended, and warns of the threat of new amendments to the controversial Human Fertilisation and Embryology Bill. He has previously ... http://www.telegraph.co.uk/news/newstopics/politics/scotland...

Fight to use dead husband's sperm

BBC UK NewsA final decision on whether she can use the sperm is now with the Human Fertilisation and Embryology Authority (HFEA), which regulates the storage of such material. Professor Lisa Jardine, Chair of the HFEA, said: "We welcome the court's ruling in ... http://news.bbc.co.uk/2/hi/uk_news/england/7659430.stm

Renowned Fertility Advocate Pamela Madsen Launches Blog and Website

ForbesHas spoken at the annual conferences for American Society for Reproductive Medicine (ASRM), the European Society for Human Reproduction and Embryology and International Consumer Support for Infertility (iCSi), for which she also served as a board ... http://www.forbes.com/prnewswire/feeds/prnewswire/2008/10/07...

BBC to pay £½m costs in IVF libel case

Times OnlineThe development came as Mr Taranissi was named as the UK’s most successful fertility doctor in annual figures released yesterday by the Human Fertilisation and Embryology Authority. His Assisted Reproduction and Gynaecology Centre had comfortably ... http://business.timesonline.co.uk/tol/news/uk/health/article...

Peter Mandelson: claims of 'poison' attack against Prime Minister are ...

Times OnlineThe Human Fertilisation and Embryology Bill promises to be another potential flashpoint, particularly if Labour MPs press to include further liberalisation of abortion laws. Other troublesome bills include the Planning Bill, opposed by some Labour ... http://www.timesonline.co.uk/tol/news/politics/article488969...

Search results for Embryology

embryology - definition of embryology by the Free Online Dictionary ...

em·bry·ol·o·gy   (m br-l-j) n. 1. The branch of biology that deals with the formation, early growth, and development of living organisms. 2. The embryonic structure or ... http://www.thefreedictionary.com/embryology

Category:Embryology - Wikimedia Commons

Media in category "Embryology" The following 124 files are in this category, out of 124 total. http://commons.wikimedia.org/wiki/Category:Embryology

Development of Human Embryology

Interactive tool for learning embryology, containing animation of stages of embryos, from the University of Illinois at Chicago. [some pages under construction]http://www.uic.edu/com/surgery/embryo/index.htm

Amphibian Embryology Tutorial

Graphical supplement for teaching and learning about amphibian development from the University of Wisconsin.http://worms.zoology.wisc.edu/frogs/welcome.html

4-H Embryology and EGG Cam - UNL Extension in Lancaster County

Embryology teaches students about science and respect for life. Students hatch chicks in the classroom and witness the exciting miracle of life. Watch chicks hatch on-line.http://lancaster.unl.edu/4h/Embryology/
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Cardinal O'Brien on Human Embryolog...

Cardinal O'Brien on Human Embryology & Fertilisation BillCardinal Keith O'Brien warns of dangers in the Human Embryology & Fertilisation BillFlash - Video

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Embryology and Quran 2Scientists’ Comments on the Scientific Miracles in the Holy Quran: The following are some comments of sci...Flash - Video

Man's developmental stages as they ...

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BYC @ Portcullis House - Embryology

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Answers for Embryology

Marthae

Why is mitosis needed in embryology in cells with multiple chromosomes unlike the bacteria?

MarthaeMitosis is the division of the nucleus. Essentially what takes place during mitosis is the chromosomes (which have been duplicated) are separated into two sets, one for each of the cells that will be...
Emza

How is embryology evidence for evolution?

EmzaEmbryology shows us the stages an organism goes through as it develops from a fertilized egg. When we look at the embryological development of different kinds of animals, we see distinct similarities...
punchzlzl

1.how is the embryology of echinoderms similar to that of vertebrates?

punchzlzl1. both are deuterostomes during the time the embryo is a blastula. 2. they are more closly related than the others
Confussed Sweetie

What is the difference between human embryology and animal embryology???

Confussed SweetieThe first thing to do is to understand that humans are animals. We have the same body parts and processes as other vertebrates, especially mammals, and so the differences in embryology are related to ...
Alex

What is some evidence of evolution through embryology?

AlexLook up acoelomate, coelomate and pseudocoelomate body plans; radial versus bilateral body symmetry; protostomes versus deuterostomes; spiral determined cleavage versus radial indeterminate cleavage; ...

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