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 bracMi. 

 Caput Jongum. 



a. circumfiexa ^ - -■ 

 humeri posterior 



a. profunda ^,^^ 

 brachii ' ! 



m. anconcEus 



m. jtexor carpi 

 ulnaris 



m. extensor carpi 

 ulnaris 



- m. supraspinatus 



- m. teres minor 



)-j- ^- n. axillaris 



■I 



-i- 



. m. triceps brachii. 

 Caput mediale 



-m, brachialis 



m. biceps brachii 



n. radialis. Ramus profundus 



- n. radialis . Ramus superficialis 



m. extensor carpi radialis 



_ m. extensor digitorum communis 

 _ m. extensor digiti quinti 



Fig. 48. — Dissection of the arm after I'emoyal of the deltoid and 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 MINOR. — The narrow, and somewhat rounded, teres minor lies 



