36 



MANAGEMENT AND BREEDING OF HORSES 



Muscles. — The horse's moving power is derived from 

 muscles, which form the lean meat and which, as a rule, 

 are indirectly attached to bones. Muscles act by virtue 

 of the property they possess of being able to shorten 

 themselves on being stimulated by the nervous system. 



FIG. 19.— MUSCLES OF THE HORSE 



1. Masseter 



2. Splenius 



3. Levator humeri 



4. Cervical trapezius 



5. Dorsal trapezius 



6. Latissimus dorsi 



7. Serratus parvus 



8. Glutens medius 



9. Sterno maxillaris 



10. Rhomboideus anterior 



11. Pectoralis parvus 



12. Antea spinatus 



They are composed of contractile fibers, and their 

 strength, other things being equal, is proportionate to 

 their thickness. (Fig. 19.) 



Tendons. — These are hard, fibrous cords of great tough- 

 ness. In order to economize space, muscles are generally 



13. Levator humeri 



14. Postea spinatus 



15. Triceps extensor brachii 



16. Triceps extensor 



17. Flexor brachii 



18. Extensor metacarpi 



magnus 



19. Extensor pedis 



20. Extensor suffraginis 



21. Flexor metacarpi 



22. Pectoralis magnus 



23. Serratus magnus 



24. Intercostal muscles 



25. Obliquus abdominis 



26. Rectus femoris 



27. Vastus externus 



28. Gluteus externus 



29. Semitendinosus 



30. Glastrocnemii 



31. Flexor phalanges 



32. Extensor phalanges 



33. Extensors lateral 



