CHAP, ii.] 



THE BRAIN. 



985 



FIG. 121. 



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. NC. 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 position 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 ; mth. of the mouth ; shl. of the 

 shoulder ; elb. of the elbow ; Dig. of the hand ; AM. 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 



