DEGENERATIONS FROM LESIONS OF TEMPORAL CORTEX. 163 



Further, from the fact that the numbers were about equal on 

 both sides from the first, I take it that those of the contra- 

 lateral bundle must have crossed over in the corpus callosum. 



The existence of fibres directly connecting the cortex with 

 the mid-brain, through the medium of the internal capsule, 

 has been shown by numerous observers. It was first stated by 

 V. Guddeji} and has since been confirmed by Flechsig - and 

 F". Monakow.^ V. Monakoio found such fibres descending from the 

 occipital lobe, and entering both upper and lower fillets. The 

 fibres in my own experiments also occupied both these, though 

 they chiefly lay in the upper fillet. 



Bechtereio,^ Edinger,^ Ohersteiner and HiU,'^ HdselJ Ferrier and 

 Turner^ also adopt the view of cortico-mesencephalic fibres. 



The fibres thus found in both fillets were never very numerous. 

 They were traceable as low as the pons, diminishing on their 

 way downwards, and no doubt ended in tegmental grey matter 

 at successively lower levels, probably furnishing cortical 

 connections with the nuclei of sensory cranial nerves. 



Thus throughout the whole chain of communicating links, a 

 bilateral plan of connection seems to be followed. One would 

 almost a priori expect this. Moreover, it is interesting to note 

 that this system of ' sensory ' communications has its homologue 

 in the mode of termination of motor paths, as Muratoff^ 

 Sherrington^^ and Melius ^^ have all shown. These observers have 



^ V. Gudden, GcsaTnmdte Ahhandluncjen. 



'^ Flechsig, " Zur Anat. u. Entwick. Gesuhiclit. d. Leitungs-B. i. Grossh. d. 

 Menscheu," Arch. f. Anat. u. Physiol., Anat. 'Abth., 1881, Vl-lb. 



'•'• Monakow, " Experim. BeitrJige z. Kenntn. d. Pyramiden n. Schleifenbahn 

 Referat," Neurol. Centralbl. 1883, s. 197-198 ; also Ibid., 1885, s. 265-268 ; also 

 Bcutschc med. JVochenschr. , xi., s. 79. 



■* Bechterew, " Uiitersuchungen u. die Schleifenschicht," Verh. d. konirjl. 

 sacks. Gesel/sch. d. JFissensch. z. Leipzig, 1885, i., ii., s. 241-244. 



^ Edinger, Vorlesungenilher d. Bau d. Nerv. Centralorg., s. 415 6^*'*^ Aufl. Leipz. 

 1900. 



'^ Obei'steiner and Hill, A7iat. of the Cent. Nerv. Organs (Lond. 1890), p. 252. 



' Husel, "Beitriige z. Anat. d. Schleifen," iV^c«?-o?. Centralbl. ,1^^:, pp. 546-549. 



* Ferrier and Turner, op, cit. 



* MuratofF, " Secund. Degener : nacli Zerstorung d. Motor-Sphiire des Gehirns, 

 etc.," Archivf. Anat., 1893, s. 97. 



^^ Sherrington, "Note on Experim. Degener. of Pyramidal Tract.," Xance^, 1., 

 1894, p. 265. 



" Melius, "Prelim. Note on Bilat. Degener. in the Sp. Cord of Monkey 

 {^facac^ls sinicus)," Proc. Boy. Soc. Land., Iv. (1894), p. 208. 



