THE ARTERIES. 



231 



the skin under the mouth. It forms a rich anastomosis with 

 branches of the Rawus mturittarii inferior of the occipital artery, 

 and with others from the pharyngeal branch of the carotid artery ; 

 a large branch passes forwards to supply the skin of the throat 

 and floor of the mouth. 



(4) The Arteria cittanea joectorig(Fig. 149 c.p.} is distributed to the 

 skin of the breast. 



4. The subclavian artery (Arttria mddama), (Fig. 150 #). 

 The subclaviau artery arises from the systemic arch immediately 

 behind the occipito-vertebral artery at the level of the second or 

 third vertebra. The artery then runs outwards alongside and in 

 front of the brachial nerve, between the 31. sulscajjularis and the 

 31. tricejtf to the arm, where it is known as the brachial artery; in 

 its course it gives off : 



a. The Arteria costo-cenricalu (Fig. 150, i). This artery arises 

 near the systemic arch, and runs backwards, parallel to the ver- 

 tebral column, over the brachial nerve, and across the transverse 

 processes of the vertebrae. It is distributed more especially to the 

 31. olliquns inter tins. 



b. The Arteria 

 roraco - clai'icula- 

 ns (Fig. 150, 2) 

 arises more ex- 

 ternally than the 

 last artery ; it 

 accompanies the 

 roraco -clavicular 

 nerve on the dor- 

 sal surface of the 

 ventral portion 

 of the shoulder- 

 girdle, and pa-- - 

 between the 3f. 

 delto'uhiix and 31. 

 svfacapularu into 

 theForamenovale, A 

 where it divides '* 

 to supply these 

 muscles and the 

 31. prdorali*. 



^ ^ 





Subclavian artery of the left side. 

 Systemic arch. * Subclaviau artery. 



Dorsal aorta. 



e Arteria cutanea medialis superior, 

 c* Arteria cutanea medialis inferior. 

 Is M. levator scapulae. 

 o.v Occipito- vertebral artery. 

 ;i Arteria pectoralis. 

 R Radial artery. 



Uhiar artery. 

 Arteria cost. >-cervicalis. 

 Arteria coraco-clavicularis. 

 Arteria scapularis posterior. 

 Arteria scapularis superior. 

 Cutaneous artery. 

 Arteria subscapularU. 



