DISSECTION OF THE DOG 



127 



from the aponeurotic origin of the deltoid and from the long head of the 

 triceps. On the lateral aspect of the shoulder- joint the muscle gives place to a 

 flattened tendon which is attached to a ridge on the lateral face of the tuber- 

 culum majus after having played over a smooth area covered by cartilage, a 



m. infraspinatus 



m. triceps brachii. 

 Caput lovgum 



a. circumfiexa 

 humeri posterior 



-m. supraspinous 



m. teres minor 



n. axillaris 



m. triceps brachii. 

 Caput mediate 



■ n. radialis 

 m. biceps brachii 

 ■ n. radialis. Ramus profundus 



- ■ n. radialis. Ramus superficialis 

 tn. extensor carpi radialis 



„ m. extensor digitorum communis 

 __.m. extensor digiti quinti 



m. extensor carpi 

 ulnaris 



Ro. 48. — Dissection of the arm after removal of the deltoid aud the lateral head of the triceps muscle. 



synovial membrane further reducing the friction. Demonstrate this arrange- 

 ment by cutting the tendon across close to its commencement, and turning 

 back the two ends. This has the further advantage of showing a greater 

 amount of the teres minor muscle. 



M. teres minoe. — The narrow, and somewhat rounded, teres minor lies 



