amniotic fluid uberon EMAPA:36771 MESH:D000653 UBERON:0000173 GAID:1155 MA:0002893 FMA:305905 CALOHA:TS-0034 Amniotic fluid is a bodily fluid consisting of watery liquid surrounding and cushioning a growing fetus within the amnion. It allows the fetus to move freely without the walls of the uterus being too tight against its body. Buoyancy is also provided. The composition of the fluid changes over the course of gestation. Initially, amniotic fluid is similar to maternal plasma, mainly water with electrolytes. As the fetus develops, proteins, carbohydrates, lipids, phospholipids originating from the lungs, fetal cells, and urea are deposited in the fluid. ENVO:02000021 VHOG:0001267 UMLS:C0002638 BTO:0000068 EV:0100123 acqua amnii liquor amnii NCIT:C13188 organism substance