THE SKULL OF A HUMAN FETUS OF 40 MM. 



CHARLES CLIFFORD MACKLIN 



James H. Richardson Fellow in Anatomy, University of Toronto 



EIGHTEEN FIGURES 



CONTENTS 



Introduction 317 



The skull as a whole 319 



Cartilage 321 



Chondrocranium 328 



Planum basale 328 



Regio occipitalis 332 



Regio otica 352 



Thirteen plates (eighteen figures) 371 



(The conclusion of this paper will appear in the September number) 



Regio orbitotemporalis 387 



Regio ethmoidalis 398 



Visceral arches 411 



Meckel's cartilage 411 



Reichert's cartilage 415 



Membrane bones 415 



Conclusion 423 



Bibliography 424 



INTRODUCTION 



Researches upon the developing human skull have been carried 

 on by various investigators, for a summary of whose results 

 reference may be made to the excellent reviews by Jacoby ('94) 

 and Levi ('00). The plate method of reconstruction, however, 

 has been applied in such investigations only within recent years, 

 and has been used in the study of fetuses in the following stages: 



317 



