THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Vol. XV. JUNE, 1894. No. 6. 



Studies of the Histology of Various Mammalian Tissues. —III. 



By henry L. OSBORN, 



st. paul, minn. 



Continued from pa^e 135. 



With frontispiece. 



ON THE CELL STRUCTURE OF THE MAMMALIAN KIDNEY. 



There is hardly any organ the histological structure 

 of which is more confusing and inextricable on a first 

 study than the kidney. This is due, in part, to the large 

 number of different tissue elements which enter into its 

 composition, and in part to its tubular structure, in con- 

 sequence of which the diJBFerent parts of the same tube 

 will be separated in sections and have no apparent rela- 

 tion. Besides having a good section properly preserved 



EXPLANATION OF PLATE. 



Fig. 1. Diagram of median section through the entire kidney, 1, ureter ; 2, 

 malpighian pyramids ; 3, cortex ; 4, capsule ; 5, pelvis 



Fig. 2. Low power view of the cortex and a small part of the malpighian 

 layer of the kidney. The tubules are slightly less crowded than in nature, 

 for the sake of clearness. 



Fig. 3. Diagram to show the different parts of a reual tubule, a, collecting 

 part ; b, collecting tubule ; c, branchings of collecting tubules ; d, the loop 

 of Henle ; e, the convoluted part and the terminal "malpighian body." 



Fig. 4. A small part of a loop of Henle in median section. Camera lucida, 

 x500 diam. Same as fig. 5. 



Fig. 5. Convoluted tubule showing the cells in section, the Inmeu in the 

 centre and the rodded structure in the basal ends of the cells. Cam. Luc, 

 x500 (nearly). See scale. 



Fig. 6. Cros-s-section of convoluted tubule. 



Fig. 7. Termination of tubule showing the location of the vascular supply, 

 and the epithelium of the tube and of the cup, .somewhat diagrammatic. 



