166 



ELEMENTS OF MAMMALIAN ANATOMY 



veins collect the l^lood from the diaphragm and empty into the 

 vena cava immediaUly caudad of the diaphragm. The several 

 hcpalic veins collect the blood from the liver, which must be 

 partly dissected away to see their entrance into the vena cava. 



a b c d 



Intima 



Endothelium. 

 Inner elastic 

 membrane. 



f Muscle fibers. 



Media ' 



Externa 



Conn, tissue. — ; 



Outer elastic 

 membrane. 



Conn, tissue. 



Vasa 

 vasorum. 



Fat cells. — 



This portion is 

 shown enlarged 

 on the left. 



Fig. 82. — A Section through a Hum.\n Ulnar Artery and Vein, Show- 

 ing THE Wall of the Artery on the Left and of the Vein on the Right. 

 The Upper Part of the Figure {a-d) is from a Section of the Same Ves- 

 sels Stained with Resorcin-fuchsin, an Elastic Tissue Stain. x 550. 



a. Circular, and h, radial elastic fibers of the media of the artery; c, external 

 elastic membrane; d, elastic fibers in the media of the vein; e, circular, and g, longi 

 tudinal muscle fibers of the media; /, endothelium. {Lewis and Stohr.) 



The two adrenohimhar veins return the blood from the supra- 

 renal bodies and body walls, lumbar veins to muscles of dorsal 

 wall and two renal veins carry the blood from the kidneys. The 

 left ovarian or spermatic vein is a tributary to the left renal, but 



