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THE ANATOMY OF THE HORSE 



MUSCLES OF THE HEAD 



TliK MUSCLES OP THE HEAD are ill number above sixty, chiefly arranged 

 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 — 



Tio. CO.— Superficial Muscles of thk IIrad. 



1. Massetfir. 



2. Nasalis loiigus labii superioris. 



S, 4. Levator labii superioris ateque nasi. 



5. Dilatator ii;iris lateralis. 



G. ZyKOUiaticiiM. 



7. Ri'trac'tor labii infevioris. 



8. Depressor labii inl'erioris. 



0. Dilatator naris anterior. 



10. 10. Orbicularis oris. 



11. a. a. Orbicularis palpebrarum. 



^ 6. Levator piilpebnu sujierioris, or corrugatdi 

 supereilii. 



12. Parotido auriculariB. 



13. Splenius. 



ANTERIOR MAXILLARY REGION 



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

 f i-om 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 lachrymal, malar, and superior maxillary 

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

 the antero-inferior part of the nostril and upper lip. Action — to dilate the 

 nostrils and to retract the upper lip. 



PtiCTRACTOR labii SUPERIORIS is situatcd 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 nostril and supcro lateral parts of the upper lip. Action — to 

 retract the upper lip. 



Nasalis loncus lahii superioris is situatcd on the upper part of the face. 

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

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



