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DEVELOPMENTAL BIOLOGY OF A FETUS

Developmental biology > Human embryogenesis (development of embryo) and development of fetus

First three
weeks

Week 1

Fertilization · Egg activation · Zygote · Cleavage · Morula · Blastula (Blastomere) · Blastocyst · Inner cell mass

Week 2
(Bilaminar)

Hypoblast · Epiblast

Week 3
(Trilaminar)

Germ layers	Archenteron/Primitive streak (Primitive pit, Primitive knot/Blastopore, Primitive groove) · Gastrula/Gastrulation · Regional specification

Ectoderm	Surface ectoderm · Neuroectoderm · Somatopleure · Neurulation · Neural crest

Endoderm	Splanchnopleure

Mesoderm	Chorda- · Paraxial (Somite/Somitomere/Sclerotome/Myotome/Dermatome) · Intermediate · Lateral plate (Intraembryonic coelom, Splanchnopleure/Somatopleure)

Extraembryonic/
uterus

Trophoblast (Cytotrophoblast, Syncytiotrophoblast)

Blastocoele · Yolk sack/exocoelomic cavity · Heuser's membrane · Extraembryonic coelom · Vitelline duct

Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) · Allantois

Placenta · Decidua (Decidual cells) · Chorionic villi/Intervillous space · Gestational sac (Amnion/Amniotic sac/Amniotic cavity, Chorion)

Histogenesis

Programmed cell death (Apoptosis) · Stem cells · Germ line development

Organogenesis

Limb development: Limb bud · Apical ectodermal ridge/AER
other structures: Eye development · Cutaneous structure development · Heart development · Development of the urinary and reproductive organs

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CONTENTS