Human prenatal development is divided into an embryonic period and a fetal period. The embryonic period begins with fertilization and ends eight weeks later. The staging of human embryos was introduced in 1914 by Franklin P. Mall at the Department of Embryology of the Carnegie Institution of Washington.
virtualhumanembryo.lsuhsc.edu/HEIRLOOM/Stages/HEP.htm virtualhumanembryo.lsuhsc.edu/HEIRLOOM/Stages/HEP.htm
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A web-based training in medical embryology ... The individual stages thus differ in how long they last . During the embryonic period most of the organ systems are established and this with an enormous rapidity. Cell divisions, movement and differentiation are the basic processes taking place during this phase.
www.embryology.ch/anglais/jfetalperiod/entwicklung01.ht... www.embryology.ch/anglais/jfetalperiod/entwicklung01.html
Prenatal development - Wikipedia, the free encyclopedia
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Prenatal or antenatal development is the process in which an embryo or fetus (or foetus ) gestates during pregnancy, from fertilization until birth. Often, the terms fetal development , foetal...
en.wikipedia.org/wiki/Prenatal_development
The embryonic three germ layers give rise to the many tissues and organs of the embryo: ... Additional pairs of somites develop in a caudal direction from days 20 to 30 (period of somite development) and the number of somites is sometimes used as a criterion for determining an embryo’s age.
www.med.umich.edu/lrc/coursepages/M1/embryology/embryo/... www.med.umich.edu/lrc/coursepages/M1/embryology/embryo/05embryonicperiod.htm
embryonic period (em”bre-on′ik pe′re-od) n In humans, the stage between the second and eighth week of embryonic development, during which ... Why is the embryonic period considered the critical period?
www.answers.com/topic/embryonic-period www.answers.com/topic/embryonic-period
Implantation &The Embryonic Period of Development; ... We have now entered the embryonic period of development (2 to 8 weeks post-conception), where the zygote is now referred to as the embryo . ... The next stage of development, from month 2 until birth , is the foetal period of development .
www.hon.ch/Dossier/MotherChild/pregnancy/implantation.h... www.hon.ch/Dossier/MotherChild/pregnancy/implantation.html
Definition of embryonic period in the Medical Dictionary. embryonic period explanation. Information about embryonic period in Free online English dictionary. What is embryonic period? Meaning of embryonic period medical term. ... The embryonic period encompasses the first 8 weeks of human development;
medical-dictionary.thefreedictionary.com/embryonic+peri... medical-dictionary.thefreedictionary.com/embryonic+period
A brief treatment of embryonic development follows. For full treatment, see morphology: Embryology. ... Limb buds also appear, and by the end of the embryonic stage, the embryo is distinguishable as a representative of its species...
www.britannica.com/EBchecked/topic/185610/embryo www.britannica.com/EBchecked/topic/185610/embryo
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www.medscape.com/medline/abstract/5088332
From stage 15 to the end of the embryonic period, the hepatic gland and its vascular channels (transverse portal sinus and hepatocardiac veins) presented considerable enlargement while hematopoietic function appeared.
www.medscape.com/medline/abstract/9718390
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