前肾

脊椎动物胚胎发生的早期，靠胚体的前端，中胚层体节出现若干对生肾节，由它形成胚胎前期肾脏，即前肾.生肾节在各类脊椎动物中数目不同，圆口类有６—１３对，软骨鱼类４—７对，硬骨鱼类３—９对，蝾螈２—４对，蛙３对，爬行类５—７对，鸟类１２对，兽类８对，人类３周时７对.羊膜动物的前肾在尚未产生肾功能之前就消失了.无羊膜动物胚胎期，前肾具有泌尿功能.尿液经体腔、肾口、前肾管和原肾管排出.相 关 词 条:前肾 |中肾 |后肾 |细胞生物学 |肾上腺 |Occurred in the early vertebrate embryo rely on embryo front mesodermal somite there were some sections of the Health and kidney, from which the early embryo to form the kidney, that is, before the kidneys. Health and kidney Festival in the number of different types of vertebrates, round mouth type there are 6-13 pairs of cartilaginous fishes 4-7 pairs of bony fish 3-9 right, Newt 2-4 pairs, three pairs of frogs, reptiles 5-7 pairs, 12 pairs of birds, beasts 8 pairs 3 weeks in 7 of human right. amniotic animals produced before the kidney in renal function have not yet gone before. no amniote embryo, before the kidney with urinary function. urine through the body cavity, kidney and mouth, pre-renal kidney tubes and the original exhaust pipe . Related term: pre-renal | mesonephros | metanephric | Cell Biology | adrenal |