298 



PRACTICAL ANATOMY. 



It presents the posterior median longitudinal fissnre,\vhich 

 is quite shallow, and on each side a round bundle of 

 fibres running the entire length of the floor of the 

 fourth ventricle, and called the fasciculi teretes. Islands 



FIG. 130. FLOOR OF FOURTH VENTRICLE. 



of ganglionic cells impart a lighter tint of color to parts 

 of the floor of the fourth ventricle, and are called the 

 blue spots and violet streaks of the floor of the ventricle. 

 The processus e cerebello ad testes are white fibres which 



