1222 



SPLANCHNOLOGY 





(Fig. 1129). The glomerular or Bowman's capsule, which surrounds the glomerulus, con- 

 sists of a basement membrane, lined on its inner surface by a layer of flattened epithelial cells. 



Glomerular capsule Neck 1st convoluted tubule 



Afferent vessel 

 Efferent vessel 



Intertubular capillaries 

 Interlobular vein 



Interlobular artery 

 Spiral tubule 



} Cortical substance 



^S^i"i\eff > -Boundary zone 



\ ^Collecting" ^ 



Medullary 

 substance 



Henle'sf Ascending limb 

 loop \Descending limb x ".; 



Arterial arch 

 Venous arch 



Duct of Bellini 



Fia. 1128. Scheme of renal tubule and its vascular supply. 



which are reflected from the lining membrane on to the glomerulus, at the point of entrance or 

 exit of the afferent and efferent vessels. The whole surface of the glomerulus is covered with a 

 continuous layer of the same cells, on a delicate supporting membrane (Fig. 1130). Thus between 

 the glomerulus and the capsule a space is left, forming a cavity lined by a continuous layer of 



FIG. 1129. Distribution of bloodvessels in cortex of kidney. 



Fia. 1130. Glomerulus. 



squamous cells; this cavity varies in size according to the state of secretion and the amount of 

 fluid present in it. In the fetus and young subject the lining epithelial cells are polyhedral or even 

 columnar. 



