CH. XLVIII.] 



MOTOR AREAS. 



677 



The following diagram (fig. 505) shows a vertical section through 

 the brain, and enables one to trace the motor-tracts to the nucleus 



ig. 50 j. Diagram to show the relative positions of the several motor tracts in their 

 course from the cortex to the eras. The section through the convolutions is vertical ; 

 that through the internal capsule, I, C, horizontal ; that through the cms also 

 horizontal. C. N., caudate nucleus; O.TH., optic thalarnas ; 1,2 and Lj, middle and 

 outer part of lenticular nucleus ; /, a, I, face, arm, and leg fibres. The words in 

 italics indicate corresponding cortical centres; F.S., fissure of Sylvius. (Gowers.) 



C.P.T: 



D.P.T. 



Fig. 5os. -Film.* are seen passing from the cortex of the Rolandic area through the corona 

 radiata to the internal capmile I.e.. ; a few collaterals to the corpus callosuin (C.C.) 

 are also put in. I.H.. island of Reil ; ('!., clauatrum; O.T., optic thalamus ; 

 C.N., caudate nucleus; L.N., lenticular nucleus. The asterisk indicate* the place of 

 decumation of the face fibres to VII., the nucleus of the seventh nerve. C.P.T., 

 crowed pyramidal tract ; D.P.T., direct pyramidal tract. 



of the seventh or facial nerve of the opposite side, and to the 

 pyramidal tracts of the spinal cord. In this and in the 



