230 ELEMENTS OF HISTOLOGY. [Chap. xxx. 



blood-vessels between the deeper part of the capsule 

 and the parenchyma of the periphery. According 

 to Eberth, a plexus of non-striped muscle cells is 

 situated underneath the capsule. 



The ureter entering the hilum enlarges into the 

 pelvis of the kidney, and with its minor recesses or 

 prolongations forms the calices. Both the pelvis and 

 the calices are limited by a wall which is a direct con- 

 tinuation of the ureter. The internal free surface is 

 lined with stratified transitional epithelium. Under- 

 neath the epithelium is a fibrous connective tissue 

 membrane (the mucosa), containing the networks of 

 capillary blood-vessels and fine nerve-fibres. Outside 

 the mucosa and insensibly passing into it is the 

 loose-textured submucosa, with groups of fat cells. 

 There are present in the sub-mucosa bundles of 

 non-striped muscular tissue, continued from the 

 ureter, in the shape of longitudinal and circular 

 bundles. 



In the pelvis of the kidney of the horse small 

 glands (simple or branched tubes), lined with a single 

 layer of columnar epithelial cells, have been observed 

 by Paladino, Sertoli, and Egli. The last-named 

 mentions also that in the pelvis of the human kidney 

 there are gland-tubes similar in structure to sebaceous 

 follicles. 



301. The large vascular trunks enter, or pass from 

 the tissue of the calices into the parenchyma of the 

 kidney between the cortex and medulla, and they are 

 accompanied by bundles of fibrous connective tissue 

 and here and there a few longitudinal bundles of non- 

 striped muscular tissue. 



In the parenchyma there is a very scanty 

 fibrous connective tissue, chiefly around the Mal- 

 pighian corpuscles and around the arterial vessels, 

 especially in the young kidney. In the papillae there 

 is relatively a great amount pf fibrous tissue. On 



