34 LIGAMENTS AND MUSCLES OF THE HORSE. 



8. Dilatator Naris Lateralis. 



Origin.— From, the superior maxilki. 



Insei'tion. — To the nostril (broad part of alar cai'tilage) 



Action — To dilate the nostril. 



9. Dilator Naris Superior. 



This muscle is composed of a few fibres arising from the extre- 

 mity of the septum nasi, and terminating on the wall of 

 the false nostril, and on the extremity of the superior tur- 

 binated bo]ie. 



Action. — To dilate the false nostril. 



10. Dilatator Naris Transveksalis. 



Composed of fi))res passing across transversely, to be attached 

 on each side on the wide part of the alar cartilages. It 

 dilates the nostrils. 



11. Dilatator Naris Inferior. 



Orirjin. — From the nasal process of pi'emaxilla, and edge of 



superior maxilla adjacent. 

 Insertion. — To the wall of the false nostril and the cartilaginous 



prolongation of the inferior turbinated bone. 

 Action — To dilate the false nostril. 



12. T)epressor Labii Superioris. 



Origin. — From the premaxilla above the interdental space. 

 Insertion. — To the upper lip. 

 Action. — To depress the upper lip. 



TEMPORO-MAXILLARY REGION. 



1. Masseter. 4. Fterygoidens externns. 



2. Temjjoralis. 5. Digastricus. 



3. Fterygoidens internus. G. StyJo-nKc.rillaris. 



1 . Masseter. 



Origin. — From the zygomatic ridge of the superior maxilla and 

 malar. 



