FACE AND FRONTAL REGION OF HEAD 9 



should be taken to avoid injury to the branches of the supra- 

 orbital nerve which pierce it. It has little or no attachment 

 to bone. Below, its fibres either blend with the fibres of the 

 orbicularis oculi or they are attached to the skin of the eye- 

 brows. Above, they terminate in the galea aponeurotica, in the 

 region of the coronal suture. The lateral border is attached 

 to the temporal ridge by aponeurotic fibres, and the medial 

 border blends with its fellow of the opposite side for a short 

 distance above the root of the nose. Above the union the 

 medial fibres of opposite sides diverge, and below it they pass 

 downwards over the nasal bones as the proceral muscles. 

 The frontalis pulls the scalp forwards. ItJs^ supplied by the 



Musculus Procerus (O.T. Pyramidalis Nasi). The proceral 

 muscles are often absent; when present, each springs from 

 the lower and medial part of the corresponding frontalis. 

 It descends over the nasal bone and ends on the dorsum 

 of the nose, where some of its fibres blend with the trans- 

 verse part of the nasalis and others are inserted into the skin. 

 \t 4$ glipplied by the facial nerve. 



Along the lower and medial border of the orbicularis oculi 

 will be found the muscles of the nose and the upper lip. 



The proper muscles of the nose are the musculus nas_alj 

 and_the_muscuhiS- depressor sejpti, but the rjrocerus alsojuay. 

 Uejooked upon as_ p5rtlv__a^agjJLjiiu^ 

 hj^a^pjj-h^jRi^ 



Musculus Nasalis. The musculus nasalis consists of two 

 parts, the pars transversa (O.T. compressor nan's) and the 

 pars alaris (O.T. dilator nan's). The pars transversa springs 

 from the root of the frontal process of the maxilla, passes 

 across the cartilaginous part of the nose, above the ala, and 

 ends in an aponeurosis which connects it with its fellow of 

 the opposite side. The pars alaris springs from the maxilla, 

 at the side of the lower part of the anterior nasal aperture, 

 and it terminates in the posterior part of the ala and the 

 mobile part of the septum of the nose. The nasalis is partly 

 concealed by the angular head of the quadratus labii superioris. 



The transverse part, acting with its fellow of the opposite 

 side, depresses the dorsum of the nose and compresses its 

 sides. The pars alaris dilates the nostril of the same side. 

 Both parts are supplied by the facial nerve. 



Musculus Depressor Septi Nasi. The depressor of the 



