Thompson — Degenerations from Lesions of Temporal Lobe. 193 



hindmost of all ; then one or more larger bundles in which the fibres- 

 were normal ; and in front of these the main set of degenerated fibres.. 

 The method of distribution was however subject to variation, and 

 leads one to believe that the relative position of the various bundles is 

 not absolutely constant. 



The existence of a definite tract in the outer part of the pes 

 pedunculi, descending from the temporal lobe, has been abundantly 

 confirmed by many observers in recent as well as former years. Amongst 

 later workers may be mentioned Dejerine,^ Van Gehuchten,^ Ferrier 

 and Turner,^ Pusateri,^ and Gerioier,^ all of whom describe this tract. 

 Van Brero^ stands alone in denying its existence. ]N"early all of the 

 authors mentioned consider that the bundle in question contains fibres 

 from the temporal lobe only. Gerwier, on the other hand, assigns 

 to it fibres from the occipital cortex as well. This view I can sub- 

 stantiate, both fi-om the fact that amongst the degenerated fibres, 

 numerous normal ones are found, and also from the results of experi- 

 ments which I made on the occipital cortex in conjunction with 

 Br. Cecil Shatv,'' and published some years ago. 



The fibres of this bundle when traced downwards were seen to 

 enter a group of cells in the pons, situated external to the pyramidal 

 bundles, and on the side of the lesion. The majority ended here, but 

 some were found crossing in the trapezium to effect a connexion, no 

 doubt, with the corresponding group of the opposite side. Thus, at 

 this stage, a bilateral communication is again established. Gerwier^ 

 also describes degenerated fibres crossing in the transverse bundles of 

 the pons after lesions of the temporal cortex. 



1 Dejerine, J., op. cit., p. 



2 Van Gehiichten, " Contrib. a I'etude du faisc. pyram. Journ. de neurol. et 

 d'Hypnol.," B. 1, p. 336-345 ; also 355-364. 



^ Ferrier and Turner, W.A., op. cit. 



* Fusateri, E., " Contrib. alio studio dell' orig. del fascio pedunc. di Tiirck e del 

 fascio long inf." II Pisani, s. 141-154. 



^Gerwier (Eeriver) A. W., *' TJeber die Endigung. in d. Hirnrinde des lat. 

 Biindels an. d. Basis d. Pedunc. cereb." Ueberschau iiber Psych, neurol. u. experim. 

 Psych. H., 3, s. 222 (Kef. in centr. Bl. f. Nervhkde., 21. Jahrg., N.F., ix. 106, 

 p. 687). 



^ Fan Brero, P.C.J. "La Termin. cort du faisc. lateral pedonculaire." Nouv 

 Iconogr. de la salpetriere. Annee 9, No. 4, p. 206-222. 



''Shaw, C, and Thompson, W.FL., " Desc. Degenerns. from Lesions of the cortex, 

 of the Occipital Lobe in Monkeys." Brit. Med. Journ., 1896, vol. ii., p. 630. 



8 Gerwier, op. cit. 



