MORPHOLOGY OF THE ROOF PLATE OF THE FORE- 

 BRAIN AND THE LATERAL CHOROID PLEXUSES 

 IN THE HUMAN EMBRYO 



PERCIVAL HAILEY 



From the AtuUortu'cnl Lnhornloni of the University of Chicago 



THIKTV-ONE FIGURES 



rOXTKXTS 



Introduction TO 



History SO 



Material and iiictliods S4 



Description S6 



1 . The 19 mm . embryo . S6 



2. The 28 mm. embryo 91 



3. The 32 mm. embryo 96 



Discussion 09 



1. Telencephalon '.lO 



2. Diencephalon 108 



Summary 110 



IXTKODI (IK IN 



The researches of Minot, von Ku))ffer, Buickhaidt, G. Elliot 

 Smith, C. Judson Herrick, J. B. Johnston and others, have 

 succeeded in honiologizing with considerable certainty the 

 structures in the roof of the prosencephalon of the lower verte- 

 brates, and of some of the lower ^Mammalia. The results of 

 these comparative studies Johnston extended to the human 

 embryo and it seemed desirable to examine some other human 

 embryos of different ages in the hope that additional light might 

 be shed on the method of development of these structures. 



79 



