Talk:Human Development Timeline Movie
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One Minute Embryology
Video Title: 1 Minute Embryology - Human Timeline
Tags: embryology, 1 minute embryology,, timeline, BGDA medicine
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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