66 



A MANUAL OF ANATOMY 



outer two-thirds. At the junction of the inner third and outer 

 two- thirds is the supra-orbital notch, sometimes a foramen, for the 

 passage of the supra-orbital nerve and artery. Occasionally there 

 is a frontal notch, inside the normal notch, for a branch of the 

 supra-orbital nerve. The extremities of the supra-orbital arch 

 form the external and internal angular processes. The external 

 process is stout and serrated for articulation with the malar. The 

 internal process is faintly marked, and lies by the side of the nasal 



Parietal Border 

 I 



Superior Temporal Ridge 



Inferior 

 Temporal Ridge 



Frontal Eminence 



Temporal Surface for 

 Temporal Muscle 



Lachrymal Fossa 



Glabella 

 Nasal Process 



^External 

 \ Angular Process 



Superciliary Ridge 

 Supra-orbital Notch 



Internal Angular Process 



Nasal Spine 



Fig. 45. — The Frontal Bone (Anterior View). 



notch, where it articulates with the lachrymal, and gives origin to 

 "some fibres of the orbicularis palpebrarum. 



On the lateral aspect of the external surface there are two curved 

 lines, called the superior and inferior temporal ridges, the superior 

 being faint and the inferior bold. They spring from the external 

 angular process, and arch upwards and backwards to become con- 

 tinuous with the corresponding ridges on the parietal. The superior 

 gives attachment to the temporal fascia, and the inferior limits 

 the temporal muscle, which arises from it and the surface below, 

 this latter forming a paf t of the temporal fossa. Below the glabella 



