ANTERIOR MAXILLARY GROUP. - / . ''n 163 



_ -^ ^■: 

 these will be more ajDiJropriately described hereafter >#Ken treat- 

 ing of the Tongue and Pharynx, and the las|i alaiigv with the 

 Larynx. 



ANTERIOR MAXILLARY GROI*. 



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

 skirH, -certain of the muscles extending further backwards ; it 

 consists of the following muscles : — 



Zygomaticus. 



Buccinator. 



Orbicularis oris. 



Levator labii superioris alteque 



Nasalis longus. [nasi. 



Dilatator naris lateralis. 



Dilatator naris transvei'sus. 

 Dilatator naris inferioris. 

 Dilatator naris superioris. 

 Depressor labii superioris. 

 Levator labii inferioris. 

 Depressor labii infeiioris. 



ZYGOMATICUS. ,< 



(Zi/ffomatico-lahicdis.) 

 ... (PL. XL 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 panriiculus, and is inserted near the angle of the mouth, its 

 fibres blending Avith the buccinator. 



AcHon. — It retracts the angle of the mouth. 



BUCCINATOR. 



[Alveolo-labialis.) 



(Pl. n. 9'. Fig. 7Q. l) 



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



molar teeth, this muscle is flat and-itfcin, and con&ists 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 antefiojly, and is penniform,, its fibres being 

 inserted along the rnferdental spaces. 



Relations'. — ^This/muscle is related superiorly with the molar 

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

 the buccal membrane. 



