ANTERIOR MAXILLARY GROUP. 163 



ANTERIOR ]\IAXILLART GROUP. 



In the broad sense this group occupies the anterior half of the 

 sl::Jl, certain of the muscles extending further backwards; it 

 consists of the following muscles : — 



Zygomaticus. 



Buccinator. 



Orbicularis oris. 



Levator labii superioris alaeque 



Nasalis longus. [nasi. 



Dilatator naris lateralis. 



Dilatator naris transversuB. 

 Dilatator naris inferioris. 

 Dilatator naris superioris. 

 Depressor labii superioris. 

 Levator labii inferioris. 

 Depressor labii inferioris. 



ZYGOMATICUS. 



{Zygomatico-lcibialis.) 



(Pl, IL 9.) 



A ribbon-shaped muscle, very pale and small, situated on the 

 fcide of the face, its fibres extending forwards. 



Attachriients . — It arises from the fascia of the masseter, near 

 the anterior aspect of the maxillary spine, being blended with 

 the panniculus, and is inserted near the angle of the mouth, its 

 fibres blending with the buccinator. 



Action. — It retracts the angle of the mouth. 



BUCCINATOR. 



(Alveolo-labialls.) 



(Pl. it. 9'. riu. 70. i) 



Situated on the side of the face, covering the diastema and 

 molar teeth, this muscle is flat and thin, and consists of two 

 layers, sometimes described as separate muscles. 



Attachments. — The internal layer arises, under the masseter, 

 from the alveolar tuberosity, and alveoli of the molar teeth of 

 both jaws, and blends with the orbicularis oris. The external 

 layer exists only anteriorly, and is penniform, its fibres being 

 inserted along the interdental spaces. 



■ Relatiaas. — This muscle is related superiorly with the molar 

 glands, postero-externally with the masseter, and internally with 

 the buccal membrane. 



