28 LIGAMEN'TS AND MUSCLES OF TflE HORSE. 



Insertion. — To the mastoid crest, and styloid process of the 



occipital. 

 Action. — To extend the head on the atlas. 



8. Obliquus Capitis Posticus. 



Origin. — From the side of the spine of the dentata. 

 Insertion. — To the superior surface of wing of atlas. 

 Action. — To rotate the head around the odontoid process. 



9. Rectus Capitis Posticus Major. 

 Origin. — From the spine of the dentata. 



Insertion. — To the occipital bone beneath the complexus. 

 Action. — To extend the head. 



10. Rectus Capitis Posticus Minor. 



Origin. — Upper surface of the ring of the atlas. 

 Insertion. — To the occipital bone beneath the preceding. 

 Action. — Same as the preceding muscle. 



DORSO-LUMBAR REGION. 



1. Trapezius dorsalis. 



2. latissimiis dorsi. 



3. Strratus anticios. ~\ 



. n u ^- f Super ficialis cos f arum. 



4. >Se7'7rUus posticus. J ^ "^ 



5. Longissinms dorsi. 



6. Transversalis costaruni. 



1. Trapezius Dorsalis. 



Origin. — From the summits of the 3rd to the 10th dorsal 



spines. 

 hisertion. — To the tubercle on the spine of the scapula. 

 Action. — It pulls the scapula upwards and backwards. 



2. Latissimus Dorst. 



Origi7i. — From the supraspinous ligament, from the 4th dorsal 



to the last lumbar vertebra. 

 Insertion. — To the internal tubercle of the humerus. 

 Action. — Flexion and inward rotation of the shoulder joint. 



