120 ADRENALS, OR SUPRARENAL CAPSULES, BY C. J. EBERTH. 



BLOODVESSELS AND LYMPHATICS. The adrenals are amongst 

 the most vascular organs in the body. Their supply of blood 

 is derived from the phrenic and cseliac arteries, from the aorta 

 and from the renals. Several branches from these vessels 

 penetrate the capsule, and accompany its processes into the 

 central medullary portion ; others form a wide-meshed capillary 

 plexus in the capsule itself; whilst others again, after traversing 

 this, and breaking up into fine branches, join the capillaries of 

 the cortex. 



The veins proceeding from the medulla discharge them- 

 selves into a large central vein, that leaves the organ by the 

 hilus, and joins the inferior vena cava. A pair of small veins 

 accompany each artery as it traverses the cortex, and open 

 into the phrenic and renal veins and the inferior cava. These, 

 according to Arnold, originate in the middle cortical layer 

 (Zona fasciculata.) 



Fig. 163. 



163. Delicate framework from the innermost cortical layer of the 

 adrenal of the Ox, with a few parenchyma cells. 



The arteries break up in the external cortical layer into 

 a capillary plexus, the rounded meshes of which contain the 

 cell meshes or parenchyma corpuscles. In the second zone, 

 by their short transverse anastomoses, these vessels form 

 radially disposed meshes ; whilst in the innermost layer they 

 are arranged in the same manner as in the most external 

 zone. 



Arnold describes vascular knots in the most external cortical layer, 

 but neither Kolliker nor I have been able to satisfy ourselves of their 



