THE SKULL AS A WHOLE. 



217 



sphenoid below. Its termination is at a vague region where several sutures approach 

 one another, called the pterion. In the lower races occasionally, but rarely in the 

 higher, the lower end of the coronal is continuous with the suture between the squa- 

 mosal and the great wing, in which case two sutures cross each other at right angles, 

 and the. pterion is a definite point, an ape-like feature. If the lower corner of the 

 parietal bone is carried downward, and the suture between the great wing and the 

 lower border of the frontal falls considerably, the general plan is that of an H, the 

 cross-piece being the suture between the parietal and the sphenoid ; but the H is 

 not often very clear. A separate bone, the epipteric, is occasionally found in this 



Fig. 251. 



Supra-orbital foramen 



Frontal 



Exter. angular process 



Lesser wing of sphenoid 



Optic foramen 



Great wingf of sphenoid 



Laclirymal groove 



Ethmoid' 



Malar 

 Superior maxillary 



Infra-orbital foramen 



Middle turbinate 



Nasal septum 



Inferior turbinate 



Anterior nasal spine 

 Styloid process 



Corrugator superctht 



rbicularis 

 palpebrarum 



Tendo oculi 

 Orbicularis 

 palpebrarum 



■Levator labii superiovii 



alcsque nasi 

 ■Levator labii superioris 



Zygoniaticus major 

 Zygoniaticus minor 

 Masseter 



evator anguli oris 



Compressor naris 



Depressor alee nasi 

 Buccinator 



Mental foramen 



Levator menti 



Depressor labii inferioris 

 ^Depressor anguli oris 

 •Platysma 



The skull from in front. 



region. (See under Growth and Age of the Skull. ) The lambdotdal suture^ sizrts 

 from the top of the mastoid on each side to run upward and backward to a point 

 separating the occipital from the parietals, the interlocking teeth being very long. 

 What is practically a continuation of this suture runs downward between the oc- 

 cipital and the mastoid. Wormian bones are often found, and sometimes in great 

 numbers, in the lambdoidal suture. Sometimes there is a very large triangular one 

 occupying the place of the upper part of the occipital. Such a one may be sub- 

 divided. We incline to consider it a Wormian bone rather than a representative of 

 the interparietal 



^ Sotura lambdoidea. 



