. The development of the chick; an introduction to embryology . nierulus.(ion., (ioiiud. I>., I>eft. Spl., Spleen. Sr. C, Cortical sub-stance of the suprarenal, s. t., Secreting tubule. T. R.,Tui)al ridge. V., Ventral. V. c. p., Posterior cardinal veinV. sc. 1., Left subcardinal vein. \N. ])., WollHan duct. Figs. 220 and 221 represent seel ions thiough Ihe nusonephroson the and eightli days respectively (see also Fig. 222,eleven days). The renal corpuscles show the typical capsuleand gloincruhis, and relation to the secreting tubules. The latterare considerably convoluted on the
. The development of the chick; an introduction to embryology . nierulus.(ion., (ioiiud. I>., I>eft. Spl., Spleen. Sr. C, Cortical sub-stance of the suprarenal, s. t., Secreting tubule. T. R.,Tui)al ridge. V., Ventral. V. c. p., Posterior cardinal veinV. sc. 1., Left subcardinal vein. \N. ])., WollHan duct. Figs. 220 and 221 represent seel ions thiough Ihe nusonephroson the and eightli days respectively (see also Fig. 222,eleven days). The renal corpuscles show the typical capsuleand gloincruhis, and relation to the secreting tubules. The latterare considerably convoluted on the sixth day, nuich more so onthe eighth day. The conducting tubules can usually be distin-guished by their smallcf caliber and thiinier walls. The Wolffian THE URINOGENITAL SYSTEM 383 duct is situated near the dorso-lateral edge of the mesonephros,and the opening of a collecting tubule into it is shown in Figure220. The renal cor])uscles are situated next the median face ofthe Wolffian body. The space between the tubules is occupied /7//^ 77fOZ ^j/mp^7! colTMtn. Fig. 221.—Transverse section through the metanephros, mesonephros,gonads and neighboring parts of an 8-day chick,bl. v., Blood vessels (sinusoids). B. W., Body-wall. col. T. Mtn.,Collecting tubules of the metanephros. M. D., MiUlerian duct. Mst., Mesen-tery, n. t. i. z., Inner zone of ne{)hrogenous tissue (metanephric). n. t. , Outer zone of the nephrogenous tissue. 8ymp. On., Sympatli^etic gang-lion of the twenty-first spinal ganglion. V. C, Centrum of verte])ra. Otherabbreviations as before. almost entiiely l)y a wide vascular network of siiuisoidal char-acter; that is, the endothelial walls of the vessels are mouldeddirectly on the basement membrane of the tuljules without anyintervening connective tissue. The circulation is described in thechapter on the vascular system. 384 THE DEVELOPMENT OF THE CHICK II. The Development of the Metanephros or Permanent Kidney The metanephros or permanent kidney snpphmts the me
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