DESCRIPTION OF THE VEINS 211 



The superficial veins are usually found between the 

 layers of the fasciae just beneath the skin. 



The deep veins accompany the arteries, as a rule, 

 and are usually found in the same sheath, derived 

 from the deep fascia. They are generally in pairs, 

 one on each side of the artery, and are termed vense 

 comites. The larger arteries have only one accom- 

 panying vein as the axillary, subclavian, popliteal, 

 femoral. 



Sinuses are venous channels found in the skull, 

 which drain the blood from the brain and its mem- 

 branes, and ultimately communicate with the right 

 and left internal jugular veins at the base of the 

 skull. Some are found between two layers of the dura, 

 and others lodged in grooves on the inner surfaces of 

 the cranial bones, ensheathed by the dura. They are 

 lined by endothelial cells continuous with that which 

 lines the veins. They are sixteen in number six 

 single and ten paired. 



Venous plexus is the name given to a number of 

 small veins communicating with each other and 

 arranged in a net-work surrounding or within any 

 organ or part of the body. 



The Veins of the Heart. The great cardiac vein 

 ascends in the anterior interventricular groove from 

 the apex of the heart to the left auriculoventricular 

 groove; along this latter it runs to the posterior surface 

 of the heart, to end in the coronary sinus. At its 

 termination it is provided with a valve. 



The right (small) coronary vein in the right auriculo- 

 ventricular groove to the -sinus. 



The coronary sinus, one inch long, is placed at the 

 back part of the auriculoventricular groove, on the 

 left side, and opens into the right auricle in front of 

 the inferior vena cava. 



The Superior Vena Cava and Innominate Veins. The 

 superior vena cava is a large trunk formed by the 

 union of the two vense innominatae, and returns the 



