BRACHIAL ARTERY. 303 



deep fascia of the fore-arm, and may be seen and felt pulsating beneath 

 the integument. The high division of the radial from the axillary is rare. 

 In one instance, I saw the axillary artery divide into three branches of 

 nearly equal size which passed together down the arm, and at the bend 

 of the elbow resolved themselves into radial, ulnar, and interosseous. But 

 the most interesting variety, both in a physiological and surgical sense, is 

 that described by Dr. Jones Quain, in his " Elements of Anatomy." " I 

 found in the dissecting-room, a few years ago, a variety not hitherto no- 

 ticed ; it was at first taken for the ordinary high division of the ulnar 

 artery. The two vessels descended from the point of division at the bor- 

 der of the axilla, and lay parallel with one another in their course through 

 the arm ; but instead of diverging, as is usual, at the bend of the elbow, 

 they converged, and united so as to form a short trunk which soon divided 

 again into the radial and ulnar arteries in the regular way." In a subject, 

 dissected by myself, this variety existed in both arms ; and I have seen 

 several instances of a similar kind. 



BRACHIAL ARTERY. 



^p*The Brachial artery passes down the inner side of the arm, from the 

 lower border of the latissimus dorsi to the bend of the elbow, where it di- 

 vides into the radial and ulnar arteries. 



Relations. In its course downwards, it rests upon the coraco-brachialis 

 muscle, internal head of the triceps, brachialis anticus, and the tendon of 

 the biceps. To its inner side is the ulnar nerve ; to the outer side, the 

 coraco-brachialis and biceps muscles ; in front it has the basilic vein, and 

 is crossed by the median nerve. Its relations, within its sheath, are the 

 venae comites. 



Plan of the Relations of the Brachial Artery. 



In Front. 



Basilic vein, 

 Deep fascia, 

 Median nerve. 



Inner Side. 

 Ulnar nerve. 



Brachial artery. 



Outer Side. 

 Coraco-brachial is, 

 Biceps. 



Behind. 



Short head of triceps, 

 Coraco-brachial is, 

 Brachialis anticus, 

 Tendon of biceps. 



The branches of the brachial artery are, the- 

 Superior profunda, 

 Inferior profunda, 

 Anastomotica magna, 

 Muscular. 



The Superior prof unda arises opposite the low r er border of the 

 dorsi, and winds around the humerus ? between the triceps and the bone, 

 to the space between the brachialis anticus and supinator longus, where it 



