THE SUPRARENAL GLANDS. 



341 



The blood-vessels of the suprarenal glands are of special interest, 

 since it has been shown that the secretion of the glands passes 

 directly or indirectly into the vessels. The following statements 

 we take from Flint : The blood-vessels, derived from various 

 sources, form in the dog a poorly developed plexus, situated in the 

 capsule. From this plexus three sets of vessels are derived, which 

 are distributed respectively in the capsule, the cortex, and the 

 medulla of the gland. The vessels of the capsule divide into 





Fig. 274. Arrangement of the intrinsic blood-vessels in the cortex and medulla of 

 the dog's adrenal (Fig. 17, Plate V, of Flint's article in " Contributions to the Science 

 of Medicine," dedicated to Professor Welch, 1900). 



capillaries, which empty into a venous plexus situated in the 

 deeper portion of the capsule. The cortical arteries divide into 

 capillaries which form networks, the meshes of which correspond 

 to the arrangement of the cells in the different parts of the cortex, 

 encircling the coiled columns of cells in the glomerular. zone, 

 while in the fascicular zone the capillaries are parallel with occa- 

 sional anastomoses. These capillaries form a fine-meshed plexus 

 in the reticular zone and unite in the peripheral portion of the 



