Cerebral ptduncln 



Hypothalamta -'- 

 Epithalamui 

 Tkalam 

 Diencephalon 

 (Inter-brain) 



Cerebral aqueduct 



/ Mrsencrphalon 

 ' . (Uid-brain) 



. (After-brain) 



Corf, 



Rhincnccfhahn, ''terminates slriat, 

 (Oljactory-braii,) 



Fig. 49. Vertical median section of a model of the brain of a human 

 embryo 13.6 mm. long: 1, Optic recess, marking the attachment of the 

 optic vesicle; 2, ridge formed by the optic chiasma; 3, optic chiasma; 

 4, infundibular recess. The limiting sulcus is visible in the model, though 

 not named, running upward from the optic recess between the thalamus and 

 the hypothalamus. (After His, from Sobotta's Atlas of Anatomy.) 



Pallium 



Corpus stratum. U 



Epithalamus (Corpus plneale) 

 ' Metathalamus 

 (Corpora geniculata) 



Corpora quadrlgemina 



Pedunculus cerebri 



Cerebellum 

 ---Fossa rbomboidea 



Medulla oblongata 



Rhinencephalon / .-' ,- 

 Pars optica hypothalaml ,-' / 

 Chiasma opticum'' ,'' 

 Hypophysis-' 



Pars mamillaris bypothalami 



Pons [Varoli] ' 



Fig. 50. A vertical median section of a model of the brain of a human fetus 

 in the third month. (After His, from Spalteholz's Atlas.) 

 118 



