750 



MOVEMENTS OF CORTICAL ORIGIN. [Book in. 



Fig. 125. Outline of Horizontal section of Brain, to shew the 

 internal capsule. (Natural size.) 



The section is taken at a level more ventral than shewn in Fig. 115. The 

 grey matter of the cortex and claustrum is left unshaded, but that of the corpus 

 striatum and optic thalamus is shaded. 



OT. optic thalamus, shewing the median, lateral, and anterior nuclei. NL. 

 nucleus lenticularis, shewing the putamen large, and the inner division of the 

 globus pallidus very small. NG. nucleus caudatus, the large head in front of, 

 and the diminishing tail behind, the thalamus. 



G. the knee of the internal capsule. From ' Eye ' to ' Dig,'' marks the posi- 

 tion of the pyramidal tract as a whole, and the several letters indicate broadly 

 the relative positions of the several constituents of the tract, named according to 

 the movements with which they are concerned ; thus Eye movements of the 

 eyes ; Hd. of the head ; Tg. of the tongue ; mill, of the mouth ; shl. of the shoul- 

 der ; elh. of the elbow ; Dig. of the hand ; Abd. of the abdomen ; Hip, of the 

 hip ; Kn. of the knee ; Dig. of the foot; 



S. the temporo-occipital tract, oc. fibres to the occipital lobe. Op. optic 

 radiation. At this level the fibres of the frontal tract, in the fore limb of the 

 capsule in front of the pyramidal tract, run almost horizontally, parallel with 

 the plane of the section. Cf. Fig. 120, Fran. 



