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Organogenesis occurs within the first trimester of fetal development.
The nervous system
Organogenesis is the process by which a mass of cells in a developing embryo differentiates and develops into a functioning organ. In the embryo, all cells are basically stem cells and all alike. Once the process of organogenesis takes place and the beginnings of specialized organs form, the fetal stage begins.
Organogenesis, the formation of organs and organ systems begin at 3 weeks. The period from 3rd to 8th week are the most critical for organogenesis and should something go wrong during this period, it may lead to major congenital anomalies.
The first to develop classification system is aristotle
organogenesis: -production of UNIPOLAR structure (shoot OR root PRIMODIUM) -vascular system CONNECTED to parent tissue somatic embryogenesis: - production of BIPOLAR structure (shoot AND root axes) - vascular system NOT CONNECTED to parent tissue
nervous system.
The Mesopotamians
The heart is the first organ to develop in a fetus. Together, blood and the circulatory system, that is powered by the heart, form the first organ system.
develop a writing system
The Qin Dynasty.
the shang dynasty.