36 LIGAMENTS AND MUSCLES OF THE HORSE. 



HYOIDEAL REGION. 



1. Mylo-hyokleus. 



2. Genio-hyoideus. 



3. Stylo-hyoideus (hyoideiis magnus). 



4. Kerato-hyoideus (hyoideus parvus). 



5. Occipi^o- stylo ideus (stylo-hyoideus). 



6. Hyoideus transverstvs. 



1 . Mylo-hyoideus. 



Origin. — From a line on tlic inner surface of tlie inferior 



maxilla near the alveoli. 

 Inseriion.— To the body and spur process of the hyoid bone, 



and to a median fibrous raphe. 

 Actio7i, — The two muscles form a sling for the tongue, which 



they raise in contracting. 



2. Genio-hyoideus. 



Origin. — From the inner surface of the inferior maxilla, near 



the symphysis. 

 Insertion. — To the spur process of the hyoid bone. 

 Action. — To draw the hyoid bone forward. 



3. Stylo-hyoideus. 



Origi7i. — From the posterior part of the great cornu of the 



hyoid bone. 

 Insertion. — To the heel process of the hyoid bone. 

 Action. — To elevate the base of the tongue and the larynx. 



4. Kerato-hyoideus (or hyoideus parvus). 



Origin. — From the posterior edge of the small cornu, and the 



adjacent part of the great cornu of the hyoid bone. 

 Insertio7i.-~ To the upper edge of the heel process. 

 Action. — To elevate the larynx. 



5. Occipito-styloideus. 



Origin. — From the styloid process of the occipital bone. 



