ANATOMY OF THE HEART AND BLOOD-VESSELS. 221 



larger and larger trunks. 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. 94 repre- 

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

 and subcutaneous areolar tissue and fat have been removed. 



FIG. 93. 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. 



The brachial artery, B, colored red, is seen lying tolerably 

 deep, and accompanied by two small veins (venae comites) 

 which communicate 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 



