34 



PRACTICAL ANATOMY. 



The Levator Menti, or Levator Labii Inferioris (Fig. 13). This is the 

 muscle by which the lower lip is protruded and elevated at the same time. Cut 

 through the mucous membrane and you will come to the muscular fibres. This 

 muscle arises from the incisive fossa, and is inserted into the integument of the 

 chin, on a plane lower than the origin of the muscle. 



The compressor narium (Fig. 14), a small muscle, arises from the superior 

 maxilla. (Fig. 10.) It is inserted, by an aponeurosis across the bridge of the 

 nose, into its fellow of the opposite side. This is a small muscle at best, and 

 very hard to demonstrate on prepared material. 



Epicranial 

 apoueurosia 



Orbicularis palpebraru 



Pyramidalis 



Levator labii superior::; 



alseque nasi 

 Compressor narium 



Dilatator uaria anterior 

 Dilatator naris posterior 



Levator labii superioris 

 2ygomatious minor 



Levator anguli oris 

 Orbicularis oris 



Depressor labii inferioris 

 Depressor anguli oris 



FIG. 14. THE SUPERFICIAL MUSCLES OF THE HEAD AND NECK. 



The corrugator supercilii (Fig. 13) is seen by cutting in the mid-line 

 above the nose through the skin and fasciae. It arises from the superciliary 

 ridge (Fig. io),and is inserted into the under part of the orbicularis palpebrarum. 

 In action it produces the deep vertical furrows of the forehead. 



The pyramidalis nasi (Fig. 14) is a part of the occipito-frontalis, continued 

 on to the nose, and inserted into the compressor iiariiim. 



The dilator naris anterior arises from the lateral cartilage of the nose, and 

 is inserted into the skin near the margin of the nose, well in front. 



