The Arm. 



53 



The 'cephalic is formed by the radial and the median- 

 cephalic veins, and, after passing up on the outer side of 

 the biceps muscle to the groove between the deltoid and 

 the pectoralis major, in which groove it runs nearly as 

 high as the clavicle, it pierces the costo-coracoid membrane 

 to enter the axillary vein. Its course agrees with a line 

 starting on the outer side of the biceps tendon, on a level 

 with the external condyle and carried upwards to the 

 groove between the deltoid and the pectoralis major, and 

 then along this groove to the clavicle. 



Nerves. Median. The landmark for the median is a 

 line drawn downwards, starting from a point, close to the 

 outer side of the upper part of the line for the brachial 

 artery, crossing the artery about the insertion of the 

 coraco-brachialis, i.e., about the middle of the shaft of 

 the humerus, and terminating, about half an inch inside of 

 the tendon of biceps at the bend of the elbow. Ulnar, a line 

 running down the inner side of the brachial line, leaving 

 the latter about the middle of the arm and passing 

 obliquely inwards to the posterior surface of internal con- 

 dyle. Musculo-cutaneous, a line starting from the outer 

 side of the axillary line, about one inch below the cora- 

 coid process, and passing obliquely, downwards and out- 

 wards, to a point on the outer side of the biceps tendon, 

 one inch above the external condyle. Musculo-spiral, a line 

 beginning at the inner side of the brachial line, about on a 

 level with the lower border of the latiss. dorsi, and. pass- 

 ing around the back of the arm, to terminate, about two 

 inches above the external condyle. 



The lymphatics, continued upwards from the forearm, 

 pass mainly along the region of the brachial artery to termi- 

 nate, above, in the axillary glands surrounding the axillary 

 vein. On the outer aspect, a smaller number follow the line 

 of the cephalic vein, and while the majority of these end 



