432 



THE ANATOMY OF THE HORSE 



MUSCLES OF THE HEAD 



TuE MUSCLES OF THE HEAD iirc in numlKT above .sixty, cliiefly arrangexl 

 in pairs, which correspond exactly with each other. Want of space will 

 not permit a minute description of each ; but the most important will 

 be found alluded to sufficiently to give an idea of their position and 

 action — 



Fin. CO.— ScPERFiciAL Muscles of tuf. IIrad. 



1. Massptpr. 



2. Nasalis longus labii superioris. 



3. 4. Levator lubii superioris alseque nasi. 



5. Dilatitor naris lateralis. 



6. Zygoinaticu.'). 



7. Hotractor labii inferioris. 



8. Depressor labii inferioris. 



0. Dilatator naris anterior. 



10. 10. Orbicularis oris. 



11. a. a. Orbicularis palpebrarum. 



— 6. Levator palpebixe superioris, or comigatoi 

 sujiercilii. 



12. Parotido auricularig. 



13. Splenius. 



ANTERIOR MAXILLARY REGION 



Zygomaticus. — Situation on the middle of the side of the face. Origin — 

 from the anterior two-thirds of the zygomatic ridge. Insertion — to the angle 

 of the mouth. Action — to retract the angle of the mouth. 



Levator labii superioris al.«;que nasi is situated on and above the 

 side of the face. Origin — from the lachr}'Tiial, malar, and superior maxillary 

 bones. Insertion — to the supero-posterior part of the nasal opening, and to 

 the anteroinferior part of the nostril and upper lip. Action — to dilate the 

 nostrils and to retract the upper lip. 



Retractor labii superioris is situated on the side of the face. 

 Origin — from the anterior part of the zygomatic ridge, and from the 

 corresponding part of the superior maxillary bone. Insertion — to the 

 sides of the no.stril and superolateral parts of the upper lip. Action — to 

 retract the upper lip. 



Nasalis longus labii superioris is situated on the upper part of the face. 

 Origin — from the infero-extcrnal part of the lachrymal and malar bones, 

 and from the inferior part of the superior maxillary bone ; at the cartilages 



