FIBRES OF THE INTERNAL CAPSULE OF THE BONNET MONKEY. 
85 
We are now in a position to point out tlie chief facts of interest to be noted in 
Table V., and which illustrate the relation between the localisation of motor or 
efferent function in the cortex and that in the capsule. Under the drawing, fig. 7, 
we have inscribed in their accurate relative positions the arrangement of the capsular 
fibres. If lines be laid obliquely as stated on p. 79, the exact correspondence of the 
cortical capsular representation will be readily seen. 
Movements of Eyelids. 
The most striking among these is that of closure of the opposite eyelids only (or in 
an incompletely evolved cortex accompanied by slight movement of the same side). 
The cortical localisation of this movement we give in fig. 7, and a line drawn 
vertically shows it to be relatively far behind the area for the other movements of 
the lids. 
So in the capsule it is found fully one-tenth to one-fifth of the length of the capsule 
further back, and thus comes into relation with the representation of the upper limb 
and angle of the mouth. No closer correspondence between the representation in the 
cortex and that in the capsule could well be imagined. 
In passing on to the next feature of special interest we would mention that we 
only observed the minuter changes in the movements of the lips, mouth, tongue, and 
jaws towards the end of this work, since our analysis of the facial region (not yet 
published) has only been carried on during the last fifteen months. Hence our 
account of these movements is necessarily brief. 
Upper Limb Movements. 
Elbow .—In describing* the analysis of the upper limb cortical representation we 
have shown that extension of the elbow is represented most anteriorly and 
superiorly, and flexion most interiorly and posteriorly, while confusion of these move¬ 
ments is localised between their foci of most intense representation. This is most 
clearly found to be also the case in the capsule. The elbow, being a simple hinge 
joint and allowing only of extension, flexion and confusion, affords a ready means for 
this comparison between the cortex and capsule, and therefore it is interesting to note 
that in every group of sections this close similarity of representation was established. 
Eingers .—So also the hinge joints of the fingers show that extension is represented 
anteriorly and flexion posteriorly in the capsule, this difference being, as seen in 
Table V., present in every group. 
Thumb .—The same also prevails for the thumb. 
Lower Limb Movements. 
Since the cortical representation of the movements of the lower limb w'as shov\^n by 
our analysis to be relatively imperfect, it was to be expected that with the mingliug 
* ‘Phil. Trans.,’ B., 1887-88. 
