546 



THE TISSUES. 



377. 



cise arrangement of the ves- 

 sels being as follows : The 

 artery divides at once on 

 entering the coil into from 

 5 to 8 branches, and each 

 of these into a bundle of 

 capillaries, which, though 

 much interlaced and convo- 

 luted, do not anastomose; 

 and ultimately merge into 

 the vas efferens in the way 

 in which they were first 

 formed. Generally, the two 

 vessels enter and quit the 

 glomerulus near together, 

 and opposite the commence- 

 ment of the tubulus; and 

 the capillary loops and con- 

 volutions are always situat- 

 ed exactly at its commence- 

 ment. The vas efferens after 

 emerging from the capsule 

 of the Malpighian body, 

 proceeds as an artery for a 

 short distance, and then di- 

 vides into two sets of capil- 

 laries the one going to the, 

 cortical portion to 



Relations of Malpighian tufts to the arterial branches 

 and the cortical portion of the uriniferous tubes (man). 

 a. Arterial branch with its terminating twigs, the injec- 

 tion having only partially filled the tuft at a.. It has 

 entirely filled, $, and passed out through the efferent 

 vessel, e, /. It has burst into the capsule at y, entered 

 the tube, t, and filled the efferent vessel, e, f. At <T it 

 has extravasated, and passed along the tube. At m the 

 injection has escaped from the capsule to a limited ex- 

 tent. (Magnified 45 diameters.) 



pass the tubuh contorti on 



all sides in a rich network which is continuous through the whole 

 cortical substance and the other taking a straight course and with 

 but few branches, between the straight tubes, and in the whole cir- 

 cumference of the pyramids, even to the papilla^ in which they are 

 continuous with the proper capillaries of these parts. (Fig. 378.) 



Kolliker describes the epithelium of the tubuli contorti as in- 

 closing the glomerulus; while at the same time the projecting free 

 portion of the glomerulus is covered by epithelium. This has also 

 been recently demonstrated in a very ingenious manner by Dr. 

 Isaacs, of this city ; though Todd and Bowman still believe that 



