362 



7 7/A' NERVE ,STX77','.W 



from the rest of the fore-brain. It comprises: 

 (1) Peripheral parts; (2) central or cortical portions; 

 the former is divided into pre- and postolfactory 

 portions. 



THE VENTRICLES OF THE BRAIN. The ventricles 

 of the brain are narrow cavities enclosed with the 

 substance of the cord. They are filled with cerebro- 



FIG. 128 



FORAMEN OF MONRO 



DDLC COMMISSURE 

 CHOROID PLEXUS OF 

 THIRD VENTRICLE 

 TAENIA THAI 



Mesal aspect of a brain sectioned in the median sagittal plane. 



spinal fluid and communicate with one another by 

 means of narrow canals and foramen. The ventricles 

 are called the lateral, third, and fourth. 



The lateral ventricles are serous cavities, have a 

 thin lining membrane covered by a layer of epithelium 

 cells (ependyma), which secretes a serous fluid. They 

 are contained one in each hemisphere, separated by 



