THE BONES OF THE HEAD 



157 



then measuring the contents in a graduated vessel. The capacity ranges from 

 about 60 to no cubic inches, and, according to their capacity, skulls are 

 divided into three groups, namely, mesoeephalic, ^\'ith a capacity of about 

 85 cubic inches, as in Chinese ; megacephalic, wth a capacity exceeding 

 that, as in Europeans ; and microcephalic, with a capacity under it, as in 

 Australians. . 



In regard to craniometry the following craniometncal terms may here be 



summarized : • r u 1 1 



Alveolar point = the point of meeting of the an tenor margins ot the alveolar 

 borders of the superior maxillae. 



Antinion = the most prominent point of the glabella. 



Asterion = the point where the parieto-mastoid, occipito-mastoid. and lamb 

 doid sutures meet. 



Auricular point = the centre of the opening of the external auditory meatus. 



Basion = the centre of the anterior margin of the foramen magnum. 



Bregma = the point of junction of the sagittal and coronal sutures. 



Dacryon = the point where the horizontal fronto-maxillary suture meets the 

 vertical lachr>'mo-maxillary suture. 



Fig. 83.- 



-The Skull at Birth, showing the Antero-laterai. 

 AND Postero-lateral Fontanelles. 



Entomion = the point near the anterior part of the parieto-mastoid sntiire 

 v.-here a process of the parietal is received into the parietal.notch of the mastoid. 



Glabella = a point midway between the supercihary ridges of the frontal. 



Gnathion, or mental point = the middle point of the anterior Up of the lower 

 border of the inferior maxilla. 



Gonion = the outer side of the angle of the inferior maxilla. 



Inion = the external occipital protuberance. 



Jugal point = a point situated at the angle which the posterior border of the 

 frontal process of the malar forms with the superior border of its zygomatic 

 process. 



Lambda = the meeting of the sagittal and lambdoid sutares. 



Nasion, or nasal point = the meeting of the two fronto-nasal sutures. 



Obelion = the point where the horizontal line connecting the parietal fora- 

 mina intersects the sagittal suture. 



Occipital point = the part of the occipital in the median plane at the greatest 

 distance from the glabella. 



Opliryon=the centre of a line drawn from one temporal ridge to the other 

 across the narrowest part of the frontal region. 



Opisthion = the centre of the posterior margin of the foramen magnura. 



