38 LABORATORY OUTLINE OF NEUROLOGY 



Draw the transverse section at the level of the VIII nerves 

 and designate on it the structures in the walls of the fourth 

 ventricle enumerated in Section 23. 



29. Now divide the entire brain into two lateral halves by a 

 vertical median cut and study the course of the ventricles as 

 thus exposed, noting the narrowing of the fourth ventricle into 

 the aqueduct of Sylvius in the isthmus, its lateral expansion in 

 the optic lobes (optocele), the vertical expansion in the thalamus 

 (third ventricle), and the connection of the latter with the first 

 and second ventricles in the cerebral hemispheres through the 

 foramen of Monro (foramen interventriculare) on each side. 



