

Fig. 20. BASE OF THE BRAIN IMMEDIATELY AFTER REMOVAL FROM SKULL. [The 

 slightly hazy appearance is due to the presence of the arachnoid membrane.] 



1, Optic nerve. 



2, Pituitary gland, which rests upon (as the brain lies base upward) the anterior sub- 

 arachnoidean space. 



3, The posterior subarachnoidean space. For the arteries and nerves consult the 

 following figures. 



