Veins of the Arm. 



451 



490. Superficial veins of the back of the right 



hand. (Partly after W. Braune.) 



V. basilica 



Processus 



styloideus 



ulnae 



The Tcins of the upper extremity 



run partly in the depth hetween the nuiscles, 

 partly in plexuses, superficially, upon the fascia 

 supei-ficialis , in the subcutaneous tissue. Both 

 possess numerous valves, the deep veins more 

 than the superficial, and are manifoldly connected 

 with one another by anastomoses, which are 

 devoid of valves. 



The deep Teins (not illustrated) follow al- 

 most exclusively the corresponding- arteries and 

 are double, with the exception of 

 those in the fingers and in the axilla. 

 In the palm they begin as single 

 vv. digitales vnlares propriae (see 

 Fig. 491), which unite to form the 

 vv. digitales volares communes and 

 go into the double arcus volaris 

 venosus super ficialis. In the de]jth 

 run the vv. metacai-peae volares, 

 which open into the double aims 

 volaris venosus profundus; they 

 send in addition several rami perfo- 

 rantes into the spatia iuterossea metacarpi 

 to the deep veins of the back of the hand, 

 several smaller and regularly two larger 

 veins into the 1 st metacarpal space and 

 through the muscles of the little finger 

 to the rete venosum di)rsale manus. From 

 the palmar arch arise th? vv. ulnares 

 and vv. radiales and fi-om these again 

 the vv. hrachiales with their tributaries, 

 corresponding exactly to the arteries. On 

 the hack of the hand the deep veins 

 accompany, as small vessels, the deep layer 

 of the rete carpi dorsale (see p. 414) and 

 emty partly into the vv. radiales, partly 

 into the rete venosum dorsale manus. 



The superficial veius of the 

 hack of the hand represent the 

 chief canals of outflow for 

 the skin. They begin upon 

 the phalanges of the fingers 

 in a plexus, which permits 

 of the recognition of longi- 

 tudinal trunks, vv. digi- 

 tales dorsales propriae, and 

 each terminates on the first 

 phalanx in the arcus veno- 

 sus digitalis which is con- 

 cave proximalward. From the 

 union of every pair of these 

 arches, arise four larger vv. 

 metacarpeae dorsales ; these 

 form the rete venosum dor- 

 sale manvs , the meshes of 

 which are elongated in the 

 direction of the long axis of 

 the Umb. 



V. cephalica 



Processus 



styloideus 



radii 



Kete venosum 

 dorsale manus 



Vv. iuter- __ 

 capitulares 



Vv. digitales ^ 

 dorsales 

 propriae 



Ramus 

 perforans 



Vv. meta- 

 carpeae 

 dorsales 



