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Development of the intra-embryonic coelomic cavity. (A) Schematic cross section human embryo of 3 weeks age. The mesoderm shows a somatic (dorsal) and splanchnic (ventral) aspect. (B) Cranio-caudal and latero-lateral folding in week 4. (C) After closure of the anterior abdominal wall the intra-embryonic coelomic cavity is formed. Organs (e.g. gut) are suspended by dorsal and sometimes ventral (not shown) mesenteries carrying blood vessels and nerves.
