2l8 



HUMAN ANATOMY. 



The lateral antero-posterior suture begins at the root of the nose and runs 

 through the orbit to the side of the head, ending at the lambdoidal. Its various 

 parts are named from the adjacent bones. Thus, it begins with the fronto-nasal, to 

 continue between the frontal and the following bones : the superior maxilla, the 

 lachrymal, the os planum of the ethmoid, the body, the lesser and greater wings of 

 the sphenoid, the malar, and in the temporal fossa the great wing of the sphenoid 

 again. Then behind the coronal it runs between the parietal above and the sphenoid 

 and temporal below. 



Fig. 252. 



Inferior temporal line Coronal suture 



Sup. temporal line 



Lambdoidal 

 suture 



External 



occipital 



protuberance 



Ext. angii. 

 lar process 

 Great wing 

 of s-phenoid 



Lachrymal 

 Nasal 



Ant. nasal 

 spine 



Mastoid process 



External auditory meatus 



Styloid process 



Mental 

 foramen 



The skull from the side. 



THE EXTERIOR OF THE CRANIUM. 



Superior Aspect.' — This is oval and broader behind than in front, showing 

 the coronal, sagittal, and the top of the lambdoidal sature. On either side is the 

 parietal eminence, and in front the smaller frontal ones. The superior, and perhaps 

 a little of the inferior, curved lines appear laterally. It is rarely quite symmetrical. 



Posterior Aspect.^ — This is circular in outline, or sometimes five-sided, having 

 an inferior, two lateral (nearly vertical), and two oblique superior borders. Below 

 the middle is the external occipital protiiberayice^ which is beneath the most posterior 

 point of the skull. 



Lateral Aspect/ — This shows nothing of the face that has not been mentioned. 

 The zygomatic arch is prominent, bridging over a deep hollow. The part of the 

 hollow above the arch is the temporal fossa, deepest in front, and nearly filled by the 

 temporal muscle. The inner wall is formed by the squamosal and the great wing of 

 the sphenoid ; the front one chiefly by the orbital plate of the malar. The infra- 

 temporal crest on the great wing separates the temporal fossa from the zygomatic fossa 

 below. (The latter fossa is described with the face, page 227.) The t^'o temporal 



* Norma verticalis. " Norma occipitalis. ^ Norma lateralis. 



