940 



DECUSSATION OF PYKAMIDS. [BOOK in. 



m.p.n. 



m ,'P- n -e.p.n. 



-.fret. 



Py.dec. 



a.l.n. 



FIG. 109. TRANSVERSE DORSOVENTRAL SECTIONS OF THE BULB (MAN) AT 

 DIFFERENT LEVELS. (Sherrington.) 



