m 



BONES OF THE CRANIUM. 



FIG. 34. 



or process arises from the FlG - 



centre of this rough edge, 

 and supports the eth- 

 moid hone "behind and 

 the nasal hones in front. 



On either side of the 

 median line and ahout 

 the centre of each lateral 

 half, is the frontal emin- 

 ence. Ahove this the sur- 

 face is smooth, helow it 

 is the superciliary arch, 

 which supports the eye-hrow ; and helow this again is the 

 upper margin of the orhit, the supra-orbital ridge. This 

 ridge terminates at its out- 

 er end in the external an- 

 gular process, and at its 

 inner, in the internal an- 

 gular process. At the in- 

 ner third of this ridge is a 

 notch, converted into a fora- 

 men hy a ligament, for 

 transmitting the supra-or- 

 bital vessels and nerve, and 

 just ahove its inner third 

 is the prominence of the 

 frontal sinus. 



On the internal surface, the median line marks the 



FIG. 33 presents a front view of the Frontal Bone, a Frontal protuberance 

 of right side. 6 Superciliary ridge, c Supra orbital ridge, d External an- 

 gular process, e Internal angular process. / Supra orbitar notch or foramen. 

 g Nasal protuberance, h Semi-circular ridge for temporal muscle, i Nasal 

 spine. 



FIG. 34 presents a view of inner surface of Frontal Bone, a Coronal suture 

 for joining frontal and parietal bones, b Ridge for attachment of falx-major. 

 c Foramen coecum. d Nasal spine, e Openings of the frontal sinuses. 

 / Orbitar plates, g- External angular process, h Serrated surface of sphe- 

 noid bone. i Line of junction of parietal bones, j Depression for glands of 

 Pacchioni. fc Squamous portion of temporal bone. 



