410 PHYSIOLOGY 



closely applied to the similar layer forming the roof of the third 

 ventricle, from which it is separated only by a process of the pia mater 

 carrying numerous blood-vessels (the velum interpositum). In the 

 adult brain the cavities of the cerebral hemispheres are known as the 



Laroinaterminalis 



Optic recess 



Optic nerve 



Optic ^commissure 



"Hypophysis 



Anterior commissure 

 Foramen of Monro 



3rd nerve 

 Corpus mammillare 



3rd ventricle 

 Cerebral peduncle 



Pong' 

 Suprapineal recess 



Pineal body 



, : . Cerebellum 



\Medulla oblongata 

 4th ventricle 

 Superior medullary velum 



Cerebral aqueduct / Corpora quadrigemina 

 FIG. 180. Median section of an adult human brain. (J. SYMINGTON.) 



lateral ventricles, the remains of the first cerebral vesicle receiving the 

 name of the third ventricle. The lower and outer part of the hemi- 

 spheres, i.e. the part which is first formed, becomes much thickened 

 and forms the corpus striatum, which is closely applied to the front 

 and outer part of the optic thalamus. In the corpus striatum two 

 masses of grey matter are developed, namely, the nucleus caudatus 

 and the nucleus lenticular is. A layer of nerve fibres ascends from the 



