INNER ASPECT OF LIMB 23 



downwards, crossing the shaft of the humerus obhquely and lying 

 successively on the tendons of the teres major and latissimus dorsi 

 muscles, the caput parvum and the bone. In front of the artery is the 

 median nerve, and posteriorly it is related to the brachial vein. Above 

 the inner condyle of the humerus it divides into the anterior and 

 posterior radial arteries. 



T'he Prehumeral Artery (25). — This is the first branch given off by 

 the brachial artery. It passes outwards from the latter across the front 

 of the humerus between the two insertions of the coraco-humeralis 

 muscle. It is distributed to the biceps, and some of its terminal branches 

 may extend to the mastoido-humeralis. This vessel is sometimes referred 

 to as the anterior circumflex artery. 



The Artery to the Biceps [zga). — This is a large branch of the brachial 

 artery, which is given off at the lower third of the humerus. It passes 

 outwards to enter the biceps muscle near its lower extremity. 



The Ulnar Artery (30). — This artery is given off as a collateral branch 

 of the brachial, which it leaves at the lower border of the caput parvum. 

 It runs obliquely downwards and backwards along this border of the 

 small head of the triceps to gain the space between the inner condyle 

 of the humerus and the olecranon process, where it places itself in 

 company with the ulnar nerve and both are covered by the scapulo-ulnaris 

 muscle. It is not further represented in the plate. 



The Posterior Radial Artery (33^). — This may be said to be the con- 

 tinuation of the brachial artery, since it is so much larger than the other 

 terminal division of that vessel, namely, the anterior radial. It com- 

 mences above the internal condyle of the humerus, and descends first on 

 the bone and subsequently on the internal lateral ligament of the elbow. 

 Behind the artery is the median nerve. The vessel continues its 

 downward course behind the tendon of insertion of the biceps, 

 and disappears between the inner edge of the radius and the flexor 

 metacarpi internus muscle. The vessels and nerve are here covered 

 by the posterior superficial pectoral muscle, but this has been 



