552 



DISSECTION OF THE FACE. 



In the face 

 the muscles 

 form three 

 groups. 



Muscles of 

 nose. 



Pyramidalis 

 nasi : 



Compressor 

 naris : 



Common 

 elevator of 

 wing of 

 nose and 

 upper lip : 



Dilator of 

 nostril : 



MUSCLES OF THE FACE (fig. 203). The superficial muscles 

 of the face are disposed in three groups : one of the nose, another 

 of the eyelids and eyebrow, and a third of the aperture of the mouth. 

 One of the muscles of mastication, viz., the masseter, is partly 

 displayed at the hinder part of the face covering the ramus of 

 the lower jaw. 



MUSCLES OF THE NOSE (fig. 202). These muscles are the 

 following: pyramidalis nasi, compressor naris, levator labii 

 superioris alseque nasi, dilator naris, and depressor alse nasi. 



The PYRAMIDALIS NASI (fig. 202 1 ), is a small fleshy slip that covers 

 the nasal bone, and appears to be a continuation of the innermost 

 part of the frontalis muscle. Its fibres are 

 attached above to the skin of the forehead ; 

 below, they end in the aponeurosis of the 

 compressor muscles over the cartilaginous 

 part of the nose. Its inner border meets 

 the muscle of the opposite side. 



Action. This muscle draws down the 

 skin of the centre of the forehead, and 

 produces transverse wrinkles at the root 

 of the nose. 



COMPRESSOR NARIS. This muscle (fig. 

 202 3 ) is not well seen till after the exami- 

 nation of the following one, by which it 

 is partly concealed. Triangular in shape, it 

 arises by its apex from the upper maxillary 

 bone near the anterior nasal aperture. The 

 fibres are directed inwards, spreading out 

 at the same time, and end in an aponeu- 

 rosis, which covers the cartilaginous part of 

 the nose, and is continued into the opposite 

 muscle. 



Action. It stretches the skin over the 

 cartilaginous part of the nose, and depresses 

 the tip of the organ. 



The LEVATOR LABII SUPERIORIS AL^QUE 



NASI (fig. 202 2 , and fig. 203) is placed by 

 the side of the nose, and arises from the 

 nasal process of the upper maxillary bone, 

 in front of the attachment of the orbicularis. The fibres pass down- 

 wards, and the most internal are attached by a narrow slip to the 

 ala of the nose, while the rest are inserted into the adjoining part 

 of the skin of the upper lip. Near its origin the muscle is partly 

 concealed by the orbicularis palpebrarum, but in the rest of its 

 extent it is subcutaneous. Its outer border joins the elevator of 

 the upper lip. 



Action. This muscle raises the upper lip and' wing of the nose, 

 forming wrinkles in the overlying skin. 



DILATATOR NARIS. In the dense tissue on the outer side of the 

 nostril are a few muscular fibres, both at the fore and back part of 



FIG. 202. MUSCLES OP 

 THE NOSE 



1. Pyramidalis nasi. 



2. Common elevator of 

 the nose and lip. 



3. Compressor naris. 

 4 and 5. The two slips 



of the dilatator naris. 



6. Depressor alse nasi. 



7. Naso-labial slip of 

 orbicularis oris. 



