298 



THE HUMAN BODY 



These in many places lie near or alongside the main artery of the 

 part, but there are many more large veins just beneath the skin 

 than there are large arteries. This is especially the case in the 

 limbs, the main veins of which are superficial, and can in many 

 persons be seen as faint blue marks through the skin. Fig. 107 

 represents the arm at the front of the elbow-joint after the skin 

 and subcutaneous areolar tissue and fat have been removed. The 



Fia. 106. A small portion of the capillary network as seen in the frog's web 

 when magnified about 25 diameters, .a, a small artery feeding the capillaries; 

 v, v, small veins carrying blood back from the latter. 



brachial artery, B, colored red, is seen lying tolerably deep, and 

 accompanied by two small veins (vence comites) which communi- 

 cate by cross-branches. The great median nerve, 1, a branch of the 

 brachial plexus which supplies several muscles of the forearm and 

 hand, the skin over a great part of the palm and the three inner 

 fingers, is seen alongside the artery. The larger veins of the part 

 are seen to form a more superficial network, joined here and there, 



