923 
direction opposite to the upper half of the oliva inferior. The sensible 
nucleus of this nerve and its motor nucleus are not included. 
6. The so-called “aberrirendes Seitenstrangfeld’’, in which are found 
the spino-thalamie (EpINGER’s) tract, the rubro-spinal (Monaxow’s) 
tract, and the ventral spino-cerebellar (Gownr’s) tract. 
c. The proximal part of the N. ambiguus, i.e. the ventral nucleus 
of the N. IX, X, and partly too of the N. XI, besides the forth-coming 
roots of these nerves. 
d. The interior portion of the Corpus restiforme (Monakow’s I. A. 
K.) with the descending root of the N. VIII that is found within it. 
Besides, in the immediate vicinity of this region is lying the 
Nucleus dorsalis N. X, especially the tractus solitarias with it nuclei, 
and if medialward this region extends really so far as the radices 
N. XII demarcate the formatio reticularis grisea, then the tractus 
vestibulo-spinalis belongs likewise to it. 
Moreover the caudal basal portion of the cerebellum must be also 
reckoned to belong to this irrigation zone. 
According to the symptoms this dorso-lateral portion of the oblongata 
is destroyed on the left side. 
As the most prominent disturbance there was found: 
I. Alternating paralysis of the sensibility for pain and for thermal 
stimuli, to the left in the region controlled by the N.V, to the right 
over the whole half of the body, with the exception of the Trigeminus-area. 
The tactile sense, localisalition and the sense of space, perception 
of passive and active movements, stereognosia, are all preserved in 
the normal way. 
The dissociation in these perceptions — aiid the literature proves 
that it has been observed more than once — is most remarkable. It 
shows that the conduction of pain- and heat-sensation within the 
entire region of the trigeminus ought necessarily to be sought for 
in the tractus spinalis of this nerve, which has been interrupted in the 
proximal oblongata. The tactile impressions may still find their way 
along the nucleus sensibilis N.V, which remains unimpaired (as are 
likewise the N. motorius and its radix mesencephalicus). It is interesting 
that the reflex-action of the cornea has disappeared and that the 
cornea no longer perceives anything. Probably the cornea — without 
tactile corpuscles and without hairs — does not possess any contriv- 
ance for the tactile sense. 
The interruption of the spino-thalamie tract on the left side is 
assumed to be responsible for the defective conduction of the thermal 
and pain-stimuli in the right half of the body. 
The lemniscus medialis, is not attained by the lesion — the long 
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