372 



SUBCLAVIAN ABTERIES. 



muscle ; it then crosses the subclavian artery, and continues transversely 

 outwards behind and parallel with the clavicle and subclavius muscle, 

 and below the posterior belly of the omo-hyoid muscle. Approaching the 

 upper margin of the scapula, under cover of the trapezius muscle, it inclines 



Fig. 264. VIEW OP 

 THE ANASTOMOSES 

 OP ARTERIES ON 

 THE SHOULDER 

 AND DORSUM OP 

 THE SCAPULA (from 

 Tiedemann). 



a, sterno-mastoid 

 muscle ; b, trapezius 

 turned towards the 

 left side; c, splenius 

 capitis, and below it 

 splenius colli ; d, 

 levator anguli sca- 

 pulaa ; e, serratus 

 posticus superior ; /, 

 rliomboideus minor, 

 and g, rhomboideus 

 major, divided from 

 the base of the sca- 

 pula; h, teres major, 

 i, teres minor ; A', 

 scapular head of the 

 triceps brachii ; I, 

 serratus magnus; n, 

 deep surface of the 

 deltoid muscle turned 

 down ; o, portion of 

 the iufraspiuatus 

 muscle attached to 

 the great tuberosity 

 of the humerus, the 

 rest having been re- 

 moved from the in- 

 fraspinal fossa ; 1, 

 occipital artery ap- 

 pearing between the 

 trapezius and sterno- 

 mastoid muscles ; 2, 

 superficial cervical 

 branch of the trans- 

 verse cervical artery ; 

 2', 2', posterior sca- 

 pular artery ; 2+, 

 its supraspinous 

 branch ; 3, supra- 

 scapular artery ; 3', 

 the same after pass- 

 ing tli rough the sca- 

 pular notch into the 

 infraspinons fossa, 

 Avhere it anastomoses 

 with 4, the dorsal 



branch of the subscapular artery ; 4', inferior scapular branch of the snbscapular ; 4", 

 some of the descending thoracic branches of the subscapular artery ; 5, posterior circumflex 

 artery emerging from the quadrangular space, and sending branches upwards on the 

 shoulder-joint, round the humerus, and downwards into the deltoid muscle ; 6, anasto- 

 mosis of the acromial branches of the suprascapular with the acromio-thoracic artery. 



