MUSCLES OF THE HEAD AND NECK. 69 



Corrugator supercillii. — A narrow, small, and pointed muscle, be- 

 neath the occipito-frontalis. Origin: internal angular process of the 

 OS frontis. — Insertion, into the occipito frontalis and orbicularis. 

 Use; makes vertical wrinkles of the forehead. 



Levator Labii superioris alceque Nasi.^ — On the side of the 

 nose. Origin, from the nasal and orbitar processes of the superior 

 maxillary bone. Insertion, into the upper lip and wing of the nose. 

 Use ; it elevates the wing and sides of the nose. 



Levator anguli Oris.^ — Small and concealed by the last. Origin, 

 from the superior maxillary bone, below the infra orbitar foramen. 

 Insertion: corner of the mouth. Use; elevates the angle of the 

 mouth. 



Zygomaticiis jninor.'^^ — 0?'igin, from the malar bone. Inser- 

 tion, into the upper Hp. Use; raises the upper lip outwardly. 



Zygomaticus major. ^^ — Origin, from the malar bone, behind the 

 last. Insertion, into the corner of the mouth. Use; draws the 

 mouth obliquely upwards and outwards. 



Depressor Labii superioris alceque Nasi. — Very much concealed. 

 Origin, from the alveolar processes of the incisor and canine teeth. 

 Insertion, into the wing of the nose and upper lip. Use; depresses 

 the upper lip and wing of the iTose. 



Depressor anguli oris.^^ — Origin, from the base of the lower 

 jaw, outside of the chin. Insertion, into the corner of the mouth. 

 Use; draws the mouth downwards. 



Depressor Labii Inferioris.^^ — Origin, from the base of the lower 

 jaw, beneath and in front of the last. Insertion, into the whole side 

 of the lower lip. Use; draws the lip downwards. 



Levator Menti.^* — Is much concealed, and best viewed from thf^ 

 inside of the lip. Origin, from the alveolar processes of the lateral 

 incisor and canine teeth. Insertion, into the lower lip. Use; ele- 

 vates the lip. 



Buccinator. ^^ — Origin, from the coronoid process of the lower 

 jaw, from the tuber of the upper jaw, and alveolar processes of both 

 jaws. Insertion, corner of the mouth and lips. Use; draws the 

 mouth backwards, and presses the food between the teeth. 



Orbicularis oris."^ — Is a circular muscle surrounding the mouth, 

 has neither bony origin nor insertion, but is much connected with 

 other muscles of the mouth. 



Masseter.^^^^ — Origi?i, from the superior maxillary and malar 

 bones, and also from the zygoma of the temporal bone. Insertion, 

 into the angle and external surface of the lower jaw. Use; draws 

 the jaw upwards and backwards ; is very strong, and consists of two 

 planes of fibres. 



Temporalis. — Origin, from the temporal fascia, and sides of the 

 temporal, frontal, and parietal bones. Insertion, into the coronoid 

 process of the lower jaw. Use; draws the jaw upwards. 



