477 



5. M. serratus magnus, 



a, 0-97 oz. 



b, . . 0-881 



c, . . 0-90/ " 



0-89 oz. 



Arises from the costal processes (pleurapophyses) and ribs of the 

 vertebrae, from the third cervical to the sixth dorsal. 



6. M. subclavius, a, 0-05 oz. 



,, b, . . 0-05\ nn _ 



" * n w • • oz. 



„ ..... c, . . 0-OoJ 



This muscle takes its origin from the inner fourth, or cartilage of 

 first rib, and is inserted along the whole length of the under surface 

 of the clavicle. 



1-13 oz. 

 0-81 oz. 



E. — Muscles of the Shoulder Joint. 



1. M. latissimus dor si, . . a, . . . . 



. . b, . . 0-71 

 „ . . c, . . 0-90 



In addition to the lat. dor si, occupying its usual position, there is 

 an accessory cutaneous muscle, like that so fully developed in the Seal 

 and other swimming animals, which is inserted, partly with the lat. 

 dorsi, and partly over the biceps, with the peetoralis ; it is, properly, a 

 part of the panniculus carnosus, and takes its origin as far down as the 

 symphysis pubis. 



2. M. peetoralis, a, 0-95 oz. 



b, 



. . l-08\ 

 . . 1-24J' 



1-16 oz. 



>> 



>} ..... c, 



takes origin from the whole length of the sternum. There is only 

 one pectoral muscle. 



3. M. coracolrachialis, b, . . 0*02 oz. 



4. M. deltoideus, a, 



b, . . 0-361 



c, . . 0-40/* 



Arises from inner third of spine of scapula and clavicle. 



0-42 oz. 

 0-38 oz. 



0-52 oz. 

 0-51 oz. 

 0-54 oz. 

 0-63 oz. 



0-03 oz. 



Arises from the anterior half-inch of lower edge of scapula, and is 

 inserted below the flat tendon of the infraspinatus ; its action is the 

 same as that of the glutceus quartus (iliocapsularis). 



K. I. A. PEOC. VOL. IX. 3 E 



5. M. supraspinatus, 



. . a, 





}> • 



. . b, . 



. 0-52\ 



>> • 



. . c, 



. 0-49 J * 



6. M. infraspinatus, 



. . a, 







. . b, . 



. 0-62\ 





. . c, 



. 0-63 }• 



7. M. teres minor, . . 



. . b, . 





