One Minute Embryology
|Embryology - 7 Dec 2021 Expand to Translate|
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|These are a set of quick introductory videos with audio commentary designed to get students to begin to think about specific embryology topics. Videos have also been posted on UNSW theBox and YouTube Embryology channel. This page is still under development in 2016.
Here is a quick description of the embryonic events in the human development timeline.
- Links: original movie page | UNSW theBox | YouTube | BGDA lecture | BGDA Prac 3 | BGDA Prac 6 | Embryonic Development | Fetal Development
Lets look at an overview of human development
Human pregnancy occurs over 9 months.
This is traditionally divided into 3 trimesters each 3 months long.
The first trimester is mainly the embryonic period.
While the second and third trimester is the fetal period of growth.
The embryonic period is divided into 23 “stages” over the first 8 weeks.
After the last menstrual cycle, this period also covers the next 2 and a half missed cycles.
Human pregnancy is measured from this last cycle, while fertilisation occurs around ovulation of the next missed cycle.
A positive pregnancy test can be seen 2 weeks later after fertilisation.
The fertilised oocyte is called a zygote, that divides to form a morula.
Further mitotic division forms a blastocyst.
Forming a bilaminar then trilaminar embryo in week 3.
Looking at events
end of week 1 - blastocyst hatching
week 2 - Implantation in the uterus
week 3 - Key developmental processes
week 4 - the heart and other structures form
Here is a quick description of the endoderm events during week 3 and 4 in developing the gastrointestinal tract.
- Links: original movie page | UNSW theBox | BGDB lecture | BGDB practical | Gastrointestinal Tract Development
External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.
Cite this page: Hill, M.A. (2021, December 7) Embryology One Minute Embryology. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/One_Minute_Embryology
- © Dr Mark Hill 2021, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G