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In people, differentiation occurs during the fetal development in the uterus.
Hydranencephaly is a rare congenital deformity (a deformity that occurs during fetal development) that is characterized by the absence of the cerebral hemispheres of the brain.
By week 8 in fetal development
Undersecretion of TH during fetal development or infancy cause cretinism, a condition characterized by dwarfism and delayed mental and sexual development.
Organogenesis occurs within the first trimester of fetal development.
Development of the germinal cell layers occurs very early in fetal development.
cartilaginous
the right and left atrium of the fetal heart.
Fetal and Fatal are both adjectives but are totally different! Fetal is descriptive of the fetus ( also written as Foetus) of an organism, which is the embryo of an animal; For example, "Fetal development in humans occurs in many stages". Fatal on the other hand is descriptive of a situation or a negative event; for example, " A fatal accident occurred down the road and several people were injured"
4 months
In the fetus, the testes are in the abdomen. As development progresses they migrate downward through the groin and into the scrotum. This event takes place late in fetal development, during the eighth month of gestation.
During the fourth week implantation of fetal development takes place. At this stage the fertilized egg is now called a blastocyst.