318 



MUSCLES AND FASCIAE. 



The Ocdpito-frontalis (Fig. 215) is a broad musculo-fibrous layer, which covers 

 the whole of one side of the vertex of the skull, from the occiput to the eye- 

 Fig. 215. Muscles of the Head, Face, and Neck. 



CORRUCATCR SUVERCILII 



OIIATOH NARIS 

 DILATOR NARIS I 

 CCMKttSSORUARHII 

 OEFKUtOR ALA 



brow. It consists of two muscular slips, separated by an intervening tendinous 

 aponeurosis. The occipital portion, thin, quadrilateral in form, and about an inch 

 and a half in length, arises from the outer two-thirds of the superior curved line 

 of the occipital bone, and from the mastoid portion of the temporal. Its fibres 

 of origin are tendinous, but they soon become muscular, and ascend in a parallel 

 direction to terminate in the tendinous aponeurosis. The frontal portion is thin, 

 of a quadrilateral form, and intimately adherent to the skin. It is broader, its 

 fibres are longer, and their structure paler than the occipital portion. Its in- 

 ternal fibres are continuous with those of the Pyramidalis Nasi. Its middle 

 fibres become blended with the Corrugator Supercilii and Orbicularis : and the 

 outer fibres are also blended with the latter muscle over the external angular 

 process. From this attachment, the fibres are directed upwards and join the 



