( 302 ) 



together with the ventral nucleus, others also believe the medial 

 nucleus to he connected with the N. trigeminus (Arriëns Ratters 1 ); 

 besides animals with a powerfully developed trigeminus (e. g. the mole) 

 possess a large medial nucleus. Consequently in regard to this case 

 the possibility is not to be denied that the medial nucleus may stand 

 in some closer relation to the sensibility of the face than the 

 ventral does. 



The above described case represents an almost unique experiment 

 taken by Nature, and it demonstrates, that isolated destruction of tin' 

 ventral thalamus-nuclei may he accompanied by loss of nil sensible 

 perception in tin' distal ends of the crossed extremities. 



EXPLANATION OF THE FIGURES. 



Fig. 1 — VII, frontal sections through the left hemisphere. Fig. I is a section frontal 

 from the red nucleus, which hits the corp. subthalamicum ; the frontal be- 

 ginning of the hearth. Fig. 11 through the red nucleus, the retrolenticular portion 

 of the capsula interna here begins. Fig. Ill through the largest expansion of the 

 hearth, the c. quadr. anterius is sectioned. Fig. IV through the corpora geniculata 

 and pulvinar thalami. Fig. V the caudal end of the hearth in the pulvinar thalaini. 



In all sections a. indicates the ana of degeneration in the retro-lenticular portion 

 of the capsula interna, situated lateral from the Gitterschicht, a t a\ the radiation 

 of the degenerative field towards the temporal radiation, « 3 «<> the radiation towards 

 the gyrus supramarginalis and towards the gyms centralis posterior, a$a s the 

 radiation towards the corpus callosurn. 



Fig VI, the section through the splenium corp. callosi. The degenerative areas. 



Fig. VII, through the splenium corp. callosi and the tapetum. 



In all figures the signification of the letters employed is as follows : 



cap. n. c. --caput nuclei caudali, caud. n. c. = Cauda nuclei caudati, c. c. — 

 corpus^ callosurn, c. f. = columna fornicis, f. I'. fimbria fornicis, f. c. — fissura 

 centralis, f. i. p. = fissura inter parietalis, f. p. c = fissura postcentralis ; f. S. — 

 fissura Sylvii, r. a. f. S. = ramus ascendens fissurae Sylvii, G. G. a. — gyrus 

 centralis anterior, G. G. p, = Gyrus centralis posterior, G. s. M. = Gyrus supra- 

 marginalis, G. L. = gyrus ling, alis, G. F. = gyrus fornicatus, G. H. = gyrus hippo- 

 campi, G. P 1 = gyrus parietalis superior, G. Para G. = gyrus paracénjralis, G. Pr = 

 gyrus praecunei, G. 0. T. = gyrus occipito-temporalis, GT,, GT 2 , GT 3 — gyri tem- 

 porales, 1. m. e. = lamina medullaris externa thalami, 1. m. i. = lamina medullaris 

 interna, p. p. = pes pedunculi, pulv. = pulvinar thalami. n. ant. = nucleus anterior 

 thalami, n. med. = nucleus medialis thalami, n. lat. = nucleus lateralis thalami, 

 n. ventr. (a. b. c.) = nucleus ventralis thalami (a b. c), Gilt. = Gitterschicht, n. c. = 

 nucleus caudatus, n. 1. = nucleus lenticularis, N. R. = nucleus ruber, m. d. N. b.== 

 medulla dorsalis nuclei rubri, s. n. = substantia nigra, c. L. = corpus subthalami- 

 cum, c. m. L. = centre median Luys), spl. c. c. = splenium corporis callosi, s.s. ext. = 

 stratum sagittale externum, s. s. int = stratum sagittale internum (radiation of 

 Gratiolet), str. t = stria terminalis, tap. = tapetum, W. = stratum medullare corporis 

 geniculati lateralis (Wernicke's triangular area), c. g. 1. = corpus geniculatum laterale, 

 c. g. i. = corpus geniculatum mediale. 



x ) G. A. Arriens Kappers. Weitere Mitteilurigen über die Phylogenese des Corp. 

 striatum und des Thalamus. Anat. Anz. 1908. Bd. XXXlll. No. 13 und 14, S. 321. 



