14 EQUINE ANATOMY. 



A deep notch closed in by the temporal and sphenoid, forming 

 the anterior and posterior lacerated foramina, separated by a liga- 

 ment. 



Articulations 6. 



Two parietal, two temporal, sphenoid and atlas. 

 PARIETAL (A WALL). 



The parietals form the roof of the cranial cavity, are developed 

 from two centres closely fused together and closed in by the occip- 

 ital, frontal, temporal and opposite parietal. 



It has external and internal surfaces, and jour borders, superior, 

 inferior, external and internal. 



The external surface shows the parietal ridge beginning at the 

 occipital protuberance and ending at the supra-orbital process of 

 the frontal. It divides the bone into two rough and one smooth 

 portions. 



The internal surface shows depressions for the brain and a 

 marked elevation, the parietal eminence, which lodges the conflu- 

 ence of the sinuses, the torcular Herophili; from this point lateral 

 ridges run, lodging the parieto-temporal confluents. In front it is 

 prolonged by the suture between the two bones, the sagittal. 



The superior border is thick and articulates with the occipital. 



The inferior border articulates with the frontal. 



The internal border articulates with its opposite. 



The external border articulates with the temporal and forms a 

 groove, the parieto-temporal canal. 



Articulations 5. 



Occipital, frontal, sphenoid, temporal and opposite. 



FRONTAL. 



The frontal (jrons, the forehead) forms the front part of the 

 roof of the cranium and part of the face. It lies between the 

 parietals above, the nasals and lachrymals below, and the tem- 

 porals laterally. 



It has two surfaces, an external and internal, and four borders, 

 a superior, inferior and two lateral. 



The External Surface shows 



A median plane surface covered with skin and forming the base 

 of the forehead. Two strong processes projecting outward form- 



