438 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, 2, 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, ¢, 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, 7). 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, 7). 
23. Thetriceps (p. 166). (a) The long head of the triceps (Fig. 
77, t; 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. 
(4) The lateral head (Fig. 75, 4). 
(c) The medial head (Fig. 79, g, 4, and/). 
24. The anconeus (p. 170, and Fig. 80, 7). 
25. The brachioradialis (p. 173, and Fig. 75, &). 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, z, 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, 7). 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. 
