43 8 APPENDIX. 



middle of this one to the middle of the vertebral border of the 

 scapula, and reflect the muscle on both sides of this incision, thus 

 determining its area of origin. Reflect the humeral end without 

 injuring the capsule of the joint. 



16. Dissect the supraspinatus (Fig. 75, a, and p. 159). Cut the 

 strong fascia free from the border of the scapula and its spine. Then 

 transect the muscle and reflect it, being careful not to injure the 

 capsule of the joint. 



17. The spinodeltoideus (Fig. 75, e, and p. 156). Find its two 

 borders, beginning with the caudal one. In freeing the very short 

 cranial border do not injure the acromiodeltoideus (Fig. 75, _/"). 

 Transect and reflect the spinodeltoid. 



18. The acromiodeltoideus (p. 157, and Fig. 75,y). Transect 

 and reflect. 



19. The infraspinatus (p. 160, and Fig. 75, c). Locate the 

 borders in the region of the great scapular notch. It is difficult to 

 separate the glenoid border from the adjacent teres minor (Fig. 

 80, c). The separation should be begun at the humerus. Transect 

 the muscle at the great scapular notch and reflect. Be careful not 

 to injure the teres minor (Fig. 80, c). 



20. The teres major (p. 163, and Fig. 75, d\ Fig. 77, c] should 

 be cut near its junction with the latissimus dorsi (Fig. 77, e). 



21. The teres minor (Fig. 80, c, and p. 161) need not be cut. 



22. The epitrochlearis (p. 164, and Fig. 65, r). 



23. The triceps (p. 166). (a) The long head of the triceps (Fig. 

 77, i; Fig. 75, g). Find first its medial border and separate it from 

 the medial head. Note the union of its lateral surface with the dor- 

 sal border of the lateral head by strong fascia, and then cut the fascia. 



(b) The lateral head (Fig. 75, h). 



(c) The medial head (Fig. 79, g, h, andy). 



24. The anconeus (p. 170, and Fig. 80, /). 



25. The brachioradialis (p. 173, and Fig. 75, k). Reflect it 

 carefully to its origin and insertion. 



26. The biceps (Fig. 77, g, and p. 165). The capsule of the 

 shoulder- joint may be opened in order to expose its origin. Its 

 insertion cannot be seen at this stage. 



27. The brachialis (Figs. 75 and 79, i, and p. 166). Work under 

 it near its union with the clavobrachial ; cut it at that point and re- 

 flect it. 



28. Extensor carpi radialis longus (p. 173, and Fig. 75, /). Note 

 the oblique tendon on the radial side of the wrist near the insertion 

 of the brachioradialis. A second tendon passes beneath its distal 

 border. This tendon may be separated into a deep and superficial 

 portion. The latter may be traced proximad to its muscle, the 

 extensor carpi radialis longus. 



29. Extensor carpi radialis brevis (p. 174^. Its tendon is the 

 deeper of the two tendons seen when isolating the tendon of the 

 extensor longus. 



