524 



THE ARTERIES 



magnus, sends branches round the lower border of the pectoralis major to the 

 mammary gland, and terminates in the intercostal muscles by anastomosing with 

 the aortic intercostals and the internal mamnmry. It als.j furnishes branches to 

 the glands of the axilla. The branches to the mammary gland in the female are 

 often of large size. 



2. The alar thoracic are small branches given off either directly from the axil- 

 lary artery to the lympliatic glands in the axiJla, or from some of the other 

 branches of the first or second part of the axillary arter}-. 



Branches of the Third Part of the Axillary Artery 



1. The subscapular artery is the largest branch of the axillary. It arises 

 opposite the lower border of the subscapularis, and runs downwards and inwards 



Fig. 348. — The Right Posteeiok Circumflex Aeterv. 

 (From a dissection by Mr. Homer in the Museum of St. Bartholomew's HospitiU. 



Suprascapular artery 

 SPINE OF SCAPULA 



Infra-spinatus, out 

 ACROMIAL PROCESS | Teres minor 



Superior profunda artery 



Posterior circnmffer artery 

 Deltoid, reflected 



ML SCI LO-SPIRA L NER \'E 



Outer head of triceps 



V EXTERNA L CUTA NEO US 

 BRANCH OF 

 MUSCULO- 

 SPIRAL NERVE 



Infra-spinatus, cut 



Teres major 



Dorsal scapular artery 



Branch of dorsal scapular artery 



NER VE TO TERES MINOR 



I 



Long head of triceps 

 CVTANEorS BRANCH OF CIRCVMFLEX NERVE, Cl'T 



along the anterior border of that muscle under cover of the latissimus dorsi as far 

 as the angle of the scapvila, where it anastomoses with the dorsal scapular, pos- 

 terior scapular, long thoracic, infrascapular, and the intercostal arteries. The lonir 

 subscapular nerve accompanies it. It supplies tlie subscapularis, teres major, 

 latissimus dorsi, and serratus magnus muscles, and gives branches to the glands 

 in the axillary space. The course of this large vessel along the posterior border of 

 the axilla sliould be remembered in opening abscesses in the axilla, and in remov- 

 ing enlarged glands from this space. It is accompanied by two veins, which 

 usually unite and then receive the dorsal scapular vein, and open as a single vein 

 of large size either into the axillary or at the confluence of the inner ])rachial vena 

 comes with the basilic vein. 



About an inch to an inch and a half from its origin, the subscapular artery gives 

 off the following large branch : — 



