The Arm. 55 



in the subclavian glands, a few cross the biceps, above the 

 middle of the arm, to end in the axillary glands. The 

 chief lympathic glands of the arm are found in connection 

 with the deep lymphatics, which accompany the brachial 

 artery, although a few are situated in the superficial tissues 

 in front, and, above, the internal condyle. An analysis 

 of the landmarks of the arm shows, that the middle of 

 the shaft of the humetus corresponds (i) to the insertion of 

 the deltoid on the outer side, and (2) to that of the coraco- 

 brachialis on the inner side of the arm ; (3) to the point 

 where the lines for the inferior profunda artery and ulnar 

 nerve leave the line of the brachial artery ; (4) to about 

 where the basilic vein and the internal cutaneous nerve 

 pierce the deep fascia (in reality this point is one-half inch 

 below the middle of the shaft) ; (5) to where the musculo- 

 spiral nerve and the superior profunda artery cross the 

 posterior surface of the humerus ; (6) to the situation 

 of the nutrient artery; ( 7 ) to the j undlion of the prismatic 

 upper part of the humerus with the flattened lower part; 

 (8) to where the median nerve crosses the brachial 

 artery ; and (9) to where the brachial artery is usually 

 compressed or ligated. 



'Operations: On the nerves of the arm. To expose 

 the ulnar nerve in the arm, for the purpose of stretching 

 it, an incision should be made, beginning about three 

 inches above the internal condyle and running, down- 

 wards, and, inwards, along the course of the nerve. After 

 dividing the integument and the superficial and deep 

 fasciae, the pulsations of the inferior profunda artery will 

 be evident, and this artery forms the deep guide to the 

 nerve, which will be found lying to the inner side of the 

 vessel. To expose the median nerve, an incision may be 

 made in any part of its course, and the structures 

 divided in the same order as in the operation of ligating 



