SUBSCAPULAR ARTERY. 



3or 



subclavian nrtery outside the scalenus anticus muscle ; 3, first part of the axillary artery 

 giving rise to the acromio-thoracic, short thoracic, &c. ; 4, third jDart of the axillary artery 

 giving rise to the subscapular, circumfles, &c. ; 5, commencement of the brachial artery ; 

 6, superficial transverse cervical artery ; 6', placed on the scalenus anticus muscle, marks 

 the ascending cervical branch ; 7, posterior scapular artery arising from the subclavian 

 artery behind the scalenus anticus muscle ; 8, acromial branches of the acromio-thoracic ; 

 9, pectoral branches of the same ; 10, long thoracic artery outside the pectoralis minor 

 muscle ; + , posterior circumflex branch of the axillary artery (the anterior circumflex 

 is seen rising from the opposite side of the same part of the axillary trunk ; 11, sub- 

 scapular arteiy passing between the subscapularis and teres minor muscles to proceed 

 to the lower angle and dorsum of the scapula ; 12, thoracic descending branch of the 

 subscapular artery. For the explanation of the references 13 to 27, to the carotid 

 artery and its branches see p. 36S. 



the inferior angle of the scapula, accompanied by the long subscapular 

 nerve; and it terminates in branches to the subscapularis, serratus 

 magnus, teres major, and latissimus dorsi muscles. It soon becomes 

 considerably diminished in size, owing to its giving ofi* a large branch 

 to the dorsum of the scapula. Its final ramifications anastomose with 

 one another and with the branches of the posterior scapular artery. 



Fig. 260.— View of 

 THE Arteries 



which ramify and 

 anastomose on the 

 Ventral Surface 

 OF THE ; Scapula, 



AND OF THE AN- 

 TERIOR Circum- 

 flex Artery (from 

 R. Quain). i 



a, coracoid process ; 

 b, tendon of the long 

 head of the biceps 

 muscle ; c, the front 

 of the capsular liga- 

 ment of the shouldex-- 

 joint ; d, tendon of 

 the latissimus dorsi 

 muscle ; c, teres 

 major ; 1, supra- 

 scapular artery de- 

 scending to the supra- 

 scapular notch, over 

 the ligament of which 



the larger part of the artery passes into the supraspinous fossa ; A, A', the axillaiy and 

 brachial artery ; 1', its subscapular branch passing through the notch and ramifying in 

 the subscapular fossa ; 2, 2, posterior scapular artery descending parallel to the base of 

 the scapula ; 2', its subscapular branches ; 3, main stem of the subscapular artery at its 

 origin from the axillary and continuation towards the dorsum of the scapula ; 3', the 

 branch to the ventral surface of the scapula proceeding to anastomose with the sub- 

 scapular branches of the suprascapular and posterior scapular arteries ; 4, descending or 

 thoracic branch of the subscapular artery ; 5, anterior circumflex artery ; 6, posterior 

 circumflex passing back through the quadrilateral muscular space. 



>. \ 



The dorsal branch (dorsalis scapulae) turns back from the subscapular 

 artery, about an inch and a half from its origin, and is sometimes larger 

 than the continuation of the vessel. Descending along the lower border 

 of the scapula, it passes through the interval bounded internally by the 

 subscapularis and teres minor, externally by the latissimus dorsi and 

 teres major, and superiorly by the long head of the triceps muscle ; and, 



