114 



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Fig. 19 Lateral view of a model of the forebrain from the 19 mm. embryo, 

 H 173. X 22§. The lateral wall of hemisphere has been cut away, exposing the 

 lateral choroid plexus. Median surface of this model is shown in figure 18. 



Fig. 20. Median view of a model of a portion of the forebrain from the 28 mm. 

 embryo, H91. X 18. 



Fig. 21 Lateral view of a model of a portion of the forebrain from the 28 mm. 

 embryo, H 91. X I'S. The lateral hemisphere wall and corpus striatum have 

 been cut away, exposing the lateral choroid plexus. Median surface shown in 

 figure 20. 



