308 



HEALTH AND DISEASE 



the size of the opening, as may be seen in the act of drinking. A 

 similar muscle {orbicularis jja^pe^rarwrn) surrounds the eyelids, which it 

 closes. 



Besides these there are others much larger and stronger, one forming 

 the anterior part of the cheeks {buccinator and caninus). These are 

 attached to the upper and lower jaw, along the margins of the sockets 

 which contain the fangs of the molar teeth. AVhen in action they throw 

 the food out of the channel of the cheek on to the grinding surface of the 

 teeth. 



Other muscles in this region are engaged in dilating the nostrils, and 

 thus ministering to the function of respiration. 



Name. 



Levator Palpebrse Siiperi- 

 oris Externus. 



Orbicularis Palpebrarum. 



Levator Palpebrae Superi- 

 oris Internus. 



Zygoraaticus. 



Levator Labii Superioris 

 Alaeque Nasi. 



Levator Labii Superioris. 



Dilator Naris Lateralis. 



Dilator Naris Anterior. 



Depressor Labii Inferioris. 



Oriinn. 



From the external surface 

 of the frontal bone. 



Surrounds the eyelids. Arises 

 from a small tubercle on 

 the lachrymal bone. 



From the bottom of the 

 orbit behind the eye. 



From the outer surface of 

 the masseter muscle. 



From the frontal and nasal 

 bone. 



From the malar and the 

 superior maxilla or upper 

 jaw-bone. 



From the anterior part of 

 the .superior maxilla or 

 upper jaw-bone. 



A small, single muscle 

 attached to the front of 

 the nasal cartilages. 



From the anterior border 

 of the lower jaw behind 

 the molar teeth. 



Insertion. 



Into the upper 

 eyelid. 



Into the skin of 

 the eyelids. 



Into the upper 

 eyelid. 



Into the angle of 

 the mouth. 



Into the outer 

 part of the nos- 

 trilandtheangle 

 of the mouth. 



Joining the ten- 

 don of its fellow 

 on the opposite 

 side, it is in- 

 serted into the 

 upper lip. 



Into the side of 

 the nostril and 

 upper lip. 



Action. 



To the skin of 

 the lower lip. 



To raise the upper 

 eyelid. 



To close the eye- 

 lids. 



Toraise the upper 

 lid. 



To retract the 

 angle of the 

 mouth. 



To dilate the nos- 

 tril and draw 

 the angle of the 

 mouth upwards. 



To elevate the 

 upper lip and 

 draw it to one 

 side. 



To dilate the nos- 

 tril and draw 

 the upper lip 

 backward. 



To dilate the nos- 

 trils. 



To depress the 

 under lip. 



