244 



THE VASCULAE SYSTEM. 



/3. The Vena vertebralis (Fig-. 160 V] arises posteriorly and runs 

 forwards over the transverse processes of the vertebrae, the Musculi 

 intertransversarii, and the M. levat. scapulae, to join the internal 

 jugular vein. In its course it receives branches (Venae spinales) 

 from the vertebral canal throug-h the intervertebral foramina, and 

 cutaneous branches which accompany the corresponding arteries and 

 nerves through the dorsal lymphatic sac. The vein pulsates in 

 consequence of its connection with the anterior lymph-heart (Miiller). 



(2) The subscapular vein (Vena subscapularis], (Fig. 160 S]. 



This vein arises in 



Fig. 161. the transverse abdo- 



minal muscles and 

 the muscles of the 

 shoulder girdle ; it 

 unites with the in- 

 ternal jugular vein 

 under the shoulder- 

 girdle. 



c. The subclavian 

 vein ( Vena subdama), 

 .^ (Fig. 159) passes 

 * backwards from the 

 anterior caval vein 

 on the dorsal surface 

 of the coracoid bone 

 and the clavicle, and 

 then under cover of 

 the Portio sternalix 

 of the M. pectoralis 

 major, to the internal 

 border of the Portio 

 ahdominalis of the 

 M. pectoralis major, 

 where it is formed 

 by the union of the 

 cutaneous vein and 

 the brachial vein. 



(i) The cutaneous 

 vein ( Vena cutanea 

 magna, Ecker; Vena 



The anterior caval vein and its branches. 



a Innominate vein. 



c.m. Cutaneous vein. 



<.*. Anterior cava vein. 



i Internal jugular vein. 



i' External jugular vein. 



I Lingual vein. 



m Mandibular vein. 



s Brachial vein. 



*.c. Subscapular vein. 



