Normal fetal development & circulationKidney and urinary tract
The metanephros forms the renal collecting system (uerters,pelvis, calyces, and the collecting ducts).
The mesenchyme of the nephrogenic cord forms the renal secretory system ( glomeruli, convoluted tubes, loops of Henle).
Nephrogenesis is complete by 36 wk.
The maturation and the concenterating ability of the fetal kidneys is gradual, it is immature in preterm infant that may lead to abnormal water , glucose, sodium, or acid-base homeostasis.
Fetal urine forms much of the amniotic fluid.
Renal agenesis result in severe oligohydramnios.