18 



Bones of the Cranium. 



19. Skull of a Foetus, 



sup. view (V 2 na t- size). 



20. Skull of a Foetus, 



side view (*/ 2 nat. size). 



F o n t a n e 1 1 e s. There are : 1 anterior fontanelle, Fontandla 

 frontcdis, 1 posterior fontanelle, Fontandla occipitalis, 2 s p h e n o i- 

 dal fontanelles, Fontandlae splic.no idales , and 2 mast old fonta- 

 nelle s, Fontanellae mastotdc.s. The anterior fontanelle is of rhombic 

 form and remains till up to the second year of life ; the smaller trian- 

 gular posterior fontanelle is almost closed at the time of birth; 

 the 2 sphenoidal fontanelles at the Anyuhts spltcnoidalis and the 

 2 mas to id fontanelles at the Anyuhis mastoideus of the parietal 

 bone have also almost disappeard at birth. The place of the fontanelles 

 is taken later on by the sutures, the coronal , sagittal , lambdoid, 

 mastoid and abnormal frontal sutures. If the brain is fully . developed, 

 the sutures blend by synostoses. 



