284 



3. M. rhomboideus (videYig. 24,//), 0-70 oz. 



Origin ; from the spinous processes of the upper half of the dorsal 

 vertebrae, all the cervical, with tivo accessory slips from the oc- 

 cipital ridge, shown at//, Pig. 24. 



Insertion ; into the vertebral edge of the scapula. 



One or more of these accessory slips of the rhomboid muscle are 

 present in most of the Macaques and Cercopitheci, and Cynoce- 

 phali ; they are to be regarded as portions of the rhomboid, with 

 origin extended to the head, and are connected with motions, of the 

 head and shruggings of the shoulder, essentially ape-like, and 

 not human. The accessory slip of the Ehomboid muscle is want- 

 ing in the Cebus. 



4. M. sternomastoideus (Fig. 24, g), ........ 0*61 oz. 



5. M. pectoral is major, 1*62 oz. 



6. M. pectoralis minor, 0'83 oz. 



This muscle is divisible into two portions, of which the first takes 

 origin from the 2nd, 3rd, 4th, 5th, and 6th ribs, and is inserted 

 into the top of the great tuberosity of the humerus, the coracoid 

 process, and capsular ligament ; this portion of the lesser pec- 

 toral weighs 0*57 oz. ; the second portion of the muscle arises 

 from the 6th, 7th, and 8th ribs, and is inserted into the upper 

 and anterior margin of the bicipital groove. 



The first portion may be regarded as a levator humeri. 



7. M. deltoideus, 137 oz. 



8. M. subclavius (second pectoral of birds?) 0*13 oz. 



Origin ; from the junction of the first rib with the sternum. 

 Insertion ; into the inferior edge of the clavicle. 



9. M. latissimus dor si, 2*57 oz. 



This muscle is inserted, by means of a broad tendon common' to it 

 with the teres major, into the humerus beneath the biceps, and 

 also by a tendinous band passing over and binding down the 

 biceps, into the outer side of the humerus. One head of the 

 triceps is attached to the latissimus dorsi, as it passes across the 

 axilla. 



10. M. serratus magnus {vide Fig. 24, i), ...... * 1*66 oz. 



In this muscle I have included the levator anguli scapula, which 



cannot be separated from it as a distinct muscle, and also the 

 distinct slip figured at * (Fig. 24), which takes its origin from 

 the posterior tubercle of the transverse process of the atlas. 



11. M. supraspinous (Fig. 24, b), 0'85 oz. 



12. M. infraspinatus, 1*07 oz. 



13. M. triceps, 3*33 oz. 



This muscle has four heads — 



1 . From the latissimus dorsi. 



2. From the anterior half of the lower edge of the scapula. 



3. 4. Double origin, fleshy, from the back of the humerus, as in 



Man. 



