104 



IRE SKULL AND THE BONES OF THE SKULL 



Anterolateral fontanelle 

 Fonticulus sphenoidalis 



Tympanic ring 

 Annulus tympanicus 



Occipital plane, or interparietal 

 portion of the occipital bone 



Planum occipitale 



Transverse suture of the occipital bone 1 

 Sutura mendosa 



Posterolateral fontanelle 

 Fonticulus mastoideus 



Base of the petrous portion of the temporal bone 

 Pyramis (basis) 



Lateral portion of the occipital bone (exoccipital) 1 

 Pars lateralis ossis occipitalis 



FIG. 229. THE DRIED SKULL OF AN INFANT BORN AT FULL TERM. SEEN FROM THE LEFT SIDE. 



Body-length, 2o\ inches. In the anterolateral fontanelle there remains part of the membranous 

 portion of the primordial cranium (membrane of the fontanelle) ; in the posterolateral fontanelle 

 there remains part of the cartil ig'mous portion of the primordial cranium. 



Anterior fontanelle 

 Fonticulus frontalis (major) \ 



Posterior fontanelle 

 Fonticulus occipitalis (minor) 



Frontal eminence 



. - Tuber frontale 



Parietal eminence 

 Tuber parietale 



Supra-occipital portion of the occipital bone 1 



Squama occipitalis 



FIG. 230. THE DRIED SKULL OF AN INFANT BORN AT FULL TERM. SEEN FROM ABOVE. 



Body-length, 2oi inches. In the anterior and in the posterior fontanelle there remain parts of the 

 membranous portion of the primordial cranium. 



1 See note to p. 57. 



Development of the Skull, 



