44G 



THE ANATU-MY OF THE HORSE 



POSTERO-EXTERNAL SCAPULAR REGION 



Triceps extensor braciiii (caput magnum) is situated upon the infero- 

 posterior part of the shoulder, occupying the angular intei-space between 

 the scapula and humerus. Origin— irom the whole length uf the posterior 



Fio. C3.— Internal View of the Muscles of the SnorLDER and Arm. 



<i. a. Cartilago at the base of the scapula. 



1. Insertion of serratus niiignus tumeil up. 



'.'. Insertion of rhoniboiileiis longus. 



3. Insertion of rhoniboideus brevis. 



4. 5. Subseapularis. 



C. Teres intemus vel major. 



7. Insertion of latissinuis dorsi. 



8. Triceps extensor brachii (eaput magnum). 



P. f'oraco hunieralis. 



10. Insertion of pectoralis. 



11. Flexor brachii. 



12. Tiioei's extensor brachii (caput tcrtium). 



13. Extensor nietacari'i inagnus. 

 11. Flexor nietacarpi int4'niU3. 



1 J. Flexor metacarpi medius. 



border as high up as the superoposterior angle of the scapula. Insertion — 

 to the inner and upper part of the olecranon. Action — to approximate the 

 scapula and humerus, and thus raise the elbow joint ; if the former is fixed, 

 to extend the arm. 



Triceps extensor BRAcnii (caput medium) lies upon the infero-external 

 pait of the shoulder and huinorus. Origin — from the humerus, just behind 



