574 



THE BLOOD-VASCULAR SYSTEM 



its lateral side by the coraco-brachialis and biceps muscles; but at the bend of 

 the elbow it sinks deeply beneath the lacertus fibrosus of the biceps into the 

 triangular interval (antecubital space) bounded on either side by the brachio- 



FiG. 468. — The Brachial Artery. (After Toldt, "Atlas of Human Anatomy" Rebman, 



London and New York.) 



Subscapular artery 



Deltoid pectoral triangle 



Thoraco- \ Acromial branch 

 acromial i 

 artery ^ Deltoid branch 



Pectoralis major 

 muscle 



Cutaneous branch- 



Coraco -brachlalis 

 muscle 



Brachial artery 



Deltoid muscle 



Biceps muscle — 



J Triceps muscle (medial head; 



Superior ulnar collateral artery 

 "Ulnar nerve 



Cutaneous branches 



^ 



Lateral antibrachial cutaneous nerve — 



Brachial artery — 



Lacertus fibrosus — 



Brachio-radialis muscle — ' 



Radial recurrent artery 1 



Axillary lymph-nodes 



^ Dorsal thoracic artery 



Circumflex scapular 

 artery 



Teres major muscle 



Latissimus dorsi muscle 

 Triceps muscle (long head) 



Tendinous connection of the triceps with 

 the latissimus dorsi 



Brachial muscle 

 Intermuscular septum 



Inferior ulnar collateral artery 



1 — Cutaneous branch 



^=k. '"tIM — Antibrachial fascia 



radialis and pronator teres, and at its bifurcation is more or less under cover 

 of these muscles (fig. 409). The sheath of the brachial artery is closely incor- 

 porated with the fascia covering tlu; bi(;eps muscle, and it is for this reason that 

 in the operation for ligaturing the v(!Ssol is apt to be retracted with the muscle. 



