Thompson — Degenerations from Lesions of Temporal Lohe. 189 



to the anterior end of the fornix, but neither their exact somxe of origin 

 nor termination could be definitely determined. 



{d) Posterior Commissure. — Some degenerated fibres were found 

 in nearly all cases in the posterior commissure. Reference to these 

 "will again be made. 



3. Projection Fihres : (ff) Retro- Lenticular Group. — The largest gi'oup 

 of degenerated fibres was in all cases traceable from the seat of injury 

 through the corona radiata towards the internal capsule (see d. 1. 

 fig. 3). On enteringHhis system of fibres, the majority were found 



Fig. o . — Vertical set;tion through anterior part of hrain of marmoset til, showing 

 sites of degeneration : — 



cl. 1. internal capsule. 



d. 2. parieto -temporal fasciculus. 



d. 3. anterior commissure. 



to occupy the retro -lenticular segment of its posterior limb, some 

 extending slightly forwards, however, between the posterior end of 

 the lenticular nucleus and the optic thalamus. Certain of these 

 fibres were seen to reach the capsule by piercing the back part of the 

 lenticular nucleus. These, no doubt, con-espond to the bundle which 



