ANTERIOR MAXILLARY GROUP. 163 



these will be more appropriately described hereafter when treat- 

 ing of the Tongue and Pharynx, and the last along with the 

 Larynx. 



ANTERIOR MAXILLARY GROUP. 



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

 skull, certain of the muscles extending further backwards ; it 

 consists of the following muscles : 



Zygoniaticus. 

 Buccinator. 

 Orbicularis oris. 



Dilatator naris transversus. 

 Dilatator naris inferioris. 

 Dilatator naris superioris. 



Levator labii superioris alneque Depressor labii superioris. 



Xasalis longus. [nasi. Levator labii inferioris. 



Dilatator naris lateralis. Depressor labii inferioris. 



ZYGOMATICUS. 

 (Zygomatico-lab ialis. ) 



(PL. II. 9.) 



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

 side of the face, its fibres extending forwards. 



Attachments. 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, 



( A Iveolo-labialis.) 



(PL. II. 9'. FIG. 70. .) 



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. 



Relations. This muscle is related superiorly with the molar 

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

 the buccal membrane. 



