Formation of gametes: spermatogenesis and oogenesis
Biological characteristics of spermatozoa and oocytes
Fertilization
The first week
Embryonic development before implantation
Segmentation
Compaction
Formation of the blastocyst
Migration of the fertilized egg
The plant
The trophoblast and its development
The placenta
The second week
Development of the bilaminar germinal disc
The third week
Gastrulation
Evolution of the three embryonic sheets
The fourth week
Neurulation
Main derivatives of the ganglionic crests
Evolution of the three encephalic vesicles
Fetal circulation and circulatory changes at birth
Twins
Elements of teratology
