概述

羊膜动物第二胚胎肾.胚胎时期 前肾出现不久，其后即出现中肾.中肾在胚胎时期持续很久（ 爬行动物保存到出生后），并具有泌尿功能.中肾占据胚体的大部分部位，从前肾后直达腰部.中肾大都无 肾口，具有 肾小体和弯曲的 肾小管以及中肾导管.尿液由肾小体滤出，经肾小管和中肾导管排出.身体前部分中肾，每一 体节仅一对 肾单位；而后部分中肾，肾单位增多， 分节现象就变得模糊.羊膜动物 胚胎发育完成后，将由后肾代替胚胎肾. 无羊膜动物的成体肾类似羊膜动物的胚胎肾.不过，雄性的 输尿管（相当中肾导管）兼输精作用.过去曾将无羊膜动物的成体肾称中肾，易同羊膜动物的胚胎肾相混淆，应称次肾或后部肾较妥.相 关 词 条:中肾 |后肾 |鱼类 | 肾血管性高血压 | 肾下垂 | 卵巢 |Amniotes second embryonic kidney. Embryonic kidney appeared before, shortly after its emergence in the kidney. In a prolonged period in the embryonic kidney (reptiles saved after birth), and has urinary tract function. In the kidney occupies most of the embryo parts directly to the waist after the former kidney. Most of the kidney without renal mouth, with renal tubular body and bending, as well as in the renal catheter. urine from the renal corpuscle filters out, through the renal tubules, and in the discharge pipe. the first part of the body in the kidney, each body section, only a pair of renal units; the latter part of the kidney, nephron number, sub-section phenomenon becomes blurred. amniote embryonic development is completed, will be replaced by embryonic kidney after the kidney. no amniotic kidney similar to the adult animals amniote embryonic kidney. However, the male of the ureter (the equivalent of the renal catheter) and the role of vas deferens. in the past there will be no amniotic animals in the adult kidney, said the kidney, with the amniotic easily confused with animal embryonic kidney should be called sub-renal or more properly the rear of renal. Related term: Secondary renal | metanephric | Fish | renovascular hypertension | renal ptosis | ovaries |