The intraembryonic coelom or embryonic body cavity is formed during the third week of human embryonic development. The earliest stage of this shows as coelomic spaces in the lateral mesoderm and cardiogenic mesoderm, which gradually join up to form one horseshoe-shaped intraembryonic cavity.
The intraembryonic coelom or embryonic body cavity is formed during the third week of human embryonic development. The earliest stage of this shows as coelomic spaces in the lateral mesoderm and cardiogenic mesoderm, which gradually join up to form one horseshoe-shaped intraembryonic cavity.
Source: Wikipedia "Intraembryonic coelom" · CC BY-SA 4.0
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