THE SKULL AND THE BONES OF THE SKULL 



57 



Tabular portion ~-. 



'Sutura mendosa 1 



Posterior condylar foramen 



Canalis hypoglossi 



Interparietal portion of the occipital bone 1 



Squama occipitalis 



- Supra-occipital portion 



Condylar portion, or exoccipital 



./ Pars lateralis 



Anterior condylar foramen 

 Canalis condyloideus 



7i 



Basilar portion, or basi-occipital Pars basilaris 



FIG. 114. THE PORTIONS OF THE OCCIPITAL BONE FROM A HUMAN FCETUS AT THE END OF THE 

 SIXTH MONTH (MONTHS OF FOUR WEEKS EACH). SEEN FROM WITHIN. 



Body-length, 12 inches. 



Internal occipital protuberance 

 Protuberantia occipitalis interna 



Squama occipita 



Tabular portion 



Anterior condylar foramen 

 Canalis condyloideus 



Posterior oondylar foramen 

 Canalis hypoglossi 



Interparietal portion of the occipital bone 



Sauama occipitalis 



*Sutura mendosa 1 



1 True supra-occipital 



portion 



Posterior intra-occipital synchondrosis 



Synchondrosis intra-occipitalis 



posterior 



Condylar portion, or exoccipital 

 Pars lateralis 



Anterior intra-occipital synchondrosis 

 Synchondrosis intra-occipitalis anterior 



'Basilar portion, or basi-occipital Pars basilaris 



FIG. 115. THE OCCIPITAL BONE OF A CHILD AGED FIFTEEN MONTHS. SEEN FROM WITHIN. 



Development of the Occipital Bone. 



