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THE DIENCEPHALIC FLOOR 2A] 
t. 
Fig. 11 Mesial view of forebrain reconstruction of 15 mm.catembryo X 75. 
The unshaded area shows the cut surfaces of the reconstruction. 2, chiasmatic 
process; 4, chiasm; 11, infundibular stem; 12, infundibular canal; 13, infundib- 
ular process; 20, lamina terminalis; 25, mammillary region; 32, post-chiasmatic 
eminence; 34, post-infundibular eminence; 35, post-infundibular recess; 37, post- 
mammillary evagination; 40, recess of infundibular process; 47, supra-optic 
crest; 42, supra-optic recess. 
nation (26). In this latter evagination is possible to recognize 
a median, a post-mammillary and two lateral recesses. The 
infundibular stem has increased in length so that the infundib- 
ular canal (12) is longer, while the infundibular process shows 
a distinct thickening along its ventro-cephalic surface, thus 
