THE ARTERIES. 



231 



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

 branches of the Bamus maxillaris inferior of the occipital artery, 

 and with others from the pharyng-eal branch of the carotid artery; 

 a larg-e branch passes forwards to supply the skin of the throat 

 and floor of the mouth. 



(4) The Arteria cutanea pectoris {Fig. 149 c.jj.) is distributed to the 

 skin of the breast. 



4. The subclavian artery {Arteria sithclavia), (Fig. 150 s). 

 The subclavian 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 M. suhscapularis and the 

 M. triceps to the arm, where it is known as the brachial artery; in 

 its course it gives off : — 



a. The Arteria costo-cervicalis (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 

 M. obliquus internns. 



Fig. 150. 



b. The Arteria 



coraco - clavicula- 

 ris (Fig. 150, 2) 

 arises more ex- 

 ternally than the 

 last artery ; it 

 accompanies the 

 coraco - clavicular 

 nerve on the dor- 

 sal surface of the 

 ventral portion 

 of the shoulder- 

 girdle, and passes 

 between the M. 

 cleUoideus and M. 

 subscapidaris into ^ , , ■ * * *,, 1 ** vi 



-' feubclaviau artery of the left side, 



\h.e Foramen ovale, a systemic arch. * Subclavian artery 



A' Dorsal aorta. 



c Arteria cutanea medialis superior. 



c' Arteria cutanea medialis inferior, 



Is M. levator scapulae. 

 o.v Occipito-vertebral artery. 



p Arteria pectoralis. 



R Radial ai-tery. 



A'— J 



where it divides 

 to supply these 

 muscles and the 

 M. pjectoralis. 



u 



Ulnar artery. 

 Arteria costo-cervicalis. 

 Arteria coraco-elavioularis. 

 Arteria scapularis posterior, 

 Arteria scapularis superior. 

 Cutaneous artery. 

 Arteria subscapularis. 



