THE KIDNEY 187 



HUMAN KIDNEY. SECTION PARALLEL WITH MALPIGHIAN PYRAMID. 

 STAINED WITH H^EMATOXYLIN AND EOSIN 



OBSERVE: (Kg. us) 



(Naked eye,) 



1. The thickness of the cortex, and its granular appearance 

 as compared with the medullary portion. 



2. The markings of the cortex. (These consist of alternating 

 light and dark lines, radiating from the bases of the Malpighian 

 pyramids. The lighter masses consist largely of collecting tubes, 

 together with ascending limbs of Henle's looped tubes otherwise 

 called medullary rays. Between these lighter areas the dark 

 labyrinths appear, in which, by careful attention, the Malpighian 

 bodies may be made out as minute red dots.) 



3. A region just outside the medullary pyramids not as well 

 marked as the outer cortex, in which few Malpighian bodies are 

 seen the boundary region. 



4. The finely striated medullary or Malpighian pyramids. 

 (The section will usually include portions of two of the last.) 



5. That the bases of the pyramids do not appear as a sharply 

 defined line, but fade into the boundary region; while the union of 

 the latter with the cortex proper is equally ill defined. 



(L.) Fig. 118. 



1. The cortical labyrinths, in which search for 



a. Portions of the interlobular arteries, together with the 

 smaller twigs of the arterial arcade. 



1). The Malpighian bodies. (The tuft or glomerulus which, 

 with this power, appears as a granular mass, is wanting in numer- 

 ous places, as indicated by the empty capsules.) 



c. The remaining area occupied largely by the convoluted 

 tubes, proximal and distal. 



2. The pyramids of Ferrein. (Observe that, as they pass into 

 the pyramids of Malpighi, they are well defined, but that they are 

 lost as they approach the region of the capsule.) 



(H.) Fig. 119. 



1. Malpighian body. (Select, after searching several fields, a 

 specimen which shows either the afferent or efferent vessel of the 

 glomerulus. It will be very difficult to find a capsule connected 

 with the neck of a proximal convoluted tube, as it rarely 



