Veins of the Arm. 



453 



V. thoracoacromialiSN 



A. axillaris , 



N. musculocutaneus | 



N. medianus ' 



V. axillaris 





V. circumflexa humeri anterior i ' 



I I 



M. deltoideus 



v. cephalica 



Vv. biaehiales 

 :M. coracobrachial is 

 ;N. medianus y sbscapularis 



V. thoracalis lateralis , 

 M. latissimus dorsi 



yr- 



^ 





Costa in 

 -V. costoaxillaris 



A , 



M. pectoralis minor 



\i-M 



M. subscapularis 



Vv. costoaxillares 



492. Veins of the right axilla, viewed from in front. 



(Arrangement as in Tig. 451.) 



3) V. mediana cubiti (see Fig. 491) is a connecting branch, which usually leads obliquely 



upward in the flexure of the elbow from the v. cephalica to the v. basUica and, 



lateralward fi*om the lacertus fibrosus, anastomoses freely with the deep veins. 



In other cases (not illustrated) a vein (v. mediana antibrachii) goes upward upon the 



middle of the volar surface of the forearm, bifurcates in the flexiu'e of the elbow and goes 



partly to the v. basUica (as a v. mediana basilica), partly to the v. cephalica (as v. mediana 



cephalica). There is always, however, even then, free anastomosis with the deep veins of 



the elbow. 



y. axillaris (axillary vein) (see also Fig. 486) arises usually at the lower margin 

 of the m. pectorahs major by the union of the two w. brachiales and extends as far as the 

 clavicle on the medial and anterior surface of the artery, which is also accompanied directly 

 by small veins. Its branches correspond to those of the artery. The T. thoracalis lateralis 

 receives the Y. thoracoepigastrica (see Fig. 504), which extends subcutaneously upward 

 fi'om the V. femoraUs or fi'om the v. epigastrica superficialis on the anterior and lateral surface 

 of the trunk. Into this or into the neighboring veins empty the TV. costoaxillares, which, 

 in the upper 6 7 intercostal spaces , cany the blood from the middle portions of the 

 vv. intercostales (see p. 455) to the axilla. The v. axillaris and its branches are richly 

 pro\dded with valves. 



