NEPHROGENOUS TISSUE 



DEVELOPING 

 RENAL 

 TUBULE 



ARCHED COLLECTING TUBULE 



GLOMERULU 

 BOWMAN'S CAPSULE 



LOOP OF HENLE 



LUNG BUD 



URACHUS 

 BLADDER 

 PHALLUS 

 STOMACH 

 UROGENITAL SINUS 



aL SEPTUM Vf 



CLOACA 



RECTUM 



SONEPHRIC KIDNEY 



EPHRIC DUCT VISCERAL ROOT 



PHRIC DUCT 



INTESTIN 



UMBILICAL 

 „.,,^ ARTERY 



METANEPHRIC 



DUCT 



ARCHED COLLECTING TUBULE 



IMARY OR STRAIGHT 

 OLLECTING TUBULE 



DISTAL 

 ONVOLUTED TUBULE 



EFFERENT 



BLOOD VESSEL 

 AFFERENT 



BLOOD VESSEL 



RENAL CORPUSCLE 

 (MALPIGHIAN BODY) 



LOOD CAPILLARIES 



ASCENDING LIMB OF 

 HENLE'S LOOP 



STRAIGHT 



COLLECTING 



TUBULE 



MESONEPHRIC DUCT 

 METANEPHRIC KIDNE' 

 METANEPHRIC DUCT 



G. 



DEVELOPING 

 MINOR CALYCES 



ALLANTOIC DUCT 

 MAJOR CALYX 



PELVIS 

 POSTANAL GUT 



.^'^CLOACAL SEPTUM 

 UROGENITAL SINUS 



DEVELOPING 

 COLLECTING DUCTS 



Fig. 348. The developing metanephric kidney. (A) Condensation of rudiment of renal 

 tubule in relation to rudiment of arched collecting tubule. (B) Renal tubular rudiment 

 has united with arched collecting tubule. (C) Later stage in differentiation of renal unit. 

 (D) Final stage in development of renal unit. (E) Developing mesonephric and meta- 

 nephric kidney of human embryo of about 5 weeks. (F & G) Mesonephric and meta- 

 nephric conditions in human embryo of 8 mm. or about sixth week of development. (H) 

 Diagram showing origin of metanephric uteric bud from caudal end of mesonephric 

 duct in human embryo approximating 5.3 mm. greatest length. (Redrawn from Felix, 

 1912, in Chap. 19, Human Embryology, by F. Keibel and F. P. Mall, Lippincott, Phila- 

 delphia.) (I) Differentiation of kidney pelvis in human embryo of 20 mm. length or 

 about seven weeks of gestation. 



785 



