BRANCHES OF THE SUBCLAVIAN ARTERY. 779 
lower part of the posterior triangle of the neck, where it les upon the trunks of 
the brachial plexus, and, as 1t runs upwards and backwards to its termination, it 
passes beneath the posterior belly of the omo-hyoid. 
Branches.—(a) Small muscular branches to the surrounding muscles. 
(>) The superficial cervical artery (a. cervicalis superficialis), usually a slender 
branch, passes beneath the trapezius; it runs upwards over the levator anguli scapule 
Levator anguli scapulee 
Posterior scapular artery f 
Suprascapular artery 
a ) 
Omo-hyoid 
oe Trapezius 
Rhomboideus minor 
Infraspinatus 
—Deltoid 
Posterior scapular J 
artery ~Teres minor 
F F —__———Circuniflex nerve 
Rhomboideus major ———— f ‘ : 
_____ Posterior circumflex 
artery 
Infraspinatus —-\\— 
Long head of triceps —_\\ ise 
_Dorsalis seapulee 
artery 
~~ ~Triceps (ext. head) 
——— Superior profunda 
artery 
——Mnusculo-spiral nerve 
Teres major — = 
Latissimus dorsi 
‘Triceps (ext. head) 
———-Brachialis anticus 
Fra. 560.—DIssECcTION OF THE BACK OF THE SHOULDER AND Uerer Arm, showing the anastomosing 
vessels on the dorsum of the scapula, and the posterior circumflex and superior profwnda arteries. 
and upon the splenius, and anastomoses with the arteria princeps cervicis, a branch of 
the occipital artery, and it sends branches downwards which accompany the spinal 
accessory nerve and anastomose with the posterior scapular and suprascapular arteries. 
(c) The posterior scapular artery descends beneath the levator anguli scapule and 
the rhomboid muscles, close to the posterior border of the scapula. It runs parallel 
with, and a short distance away from, the nerve to the rhomboid muscles, and it sends 
branches into the supraspinous, the infraspinous, and the subscapular fossee, which 
