PLATE 10 
EXPLANATION OF FIGURES 
39 Sagittal section through the hemisphere. Golgi method. x 9. Shows 
cells of the corpus precommissurale sending axones, the fibrae precommissurales 
striaticae, into the palaeostriatum. Both ascending and descending fibers of the 
tractus strio-thalamicus are shown; note especially the dichotomous branching 
of the ascending neurites to form tangential fibers. 
40 Cell of origin of the tractus olfacto-thalamicus medialis from the nucleus 
medianus. Golgi method. 94. From sagittal section. 
41-42 Association cells of the nucleus medianus. Golgimethod. 93. From 
sagittal section. 
43 One of the neurones of the nucleus medianus, the neurite of which forms one 
of the fibrae precommissurales striaticae. Golgi method. X 93. (See fig. 39.) 
From sagittal section. 
44 Cells of the palaeostriatum. Toluidin blue method. > 575. From trans- 
verse section. 
45 Neurone from cerebral hemisphere. Golgi method. X 93. From sagittal 
section, neurite directed caudad, into tractus strio-thalamicus. Thisneurone can 
hardly be assigned to a definite region, as it lies about midway between the typical 
cells of the palaeostriatum and those of the area olfactoria lateralis. It will be 
noted that its perikaryon is larger than that of typical cells of the area olfactoria 
lateralis but that its dendrites do not show the conspicuous thorns of the typical 
palaeostriatal neurones. 
46 Cells of the dorsal portion of the corpus precommissurale, pars supracom- 
missuralis. Toluidin blue method. From transection. X 575. 
47 Cells of the nucleus pyriformis. Toluidinbluemethod. From transection. 
oe Hylae 
48 Neurone from the nucleus olfactorius lateralis. Golgi method. X 93. 
From sagittal section. This cell is found in the dorsal portion of the hemisphere, 
adjacent to the nucleus olfactorius dorsalis, but in the region called epistriatum by 
Johnston; its neurite enters the tractus strio-thalamicus. 
49 Neurone from the nucleus olfactorius lateralis. Golgi method. xX 93. 
From sagittalsection. This is found in the rostro-lateral portion of the hemi- 
sphere; it comes into association with the ascending fibers of the tractus thalamo- 
striaticus as shown also in figs. 50 and 51. 
fib. precom. str., fibrae precommissurales striatici; hab., habenula; tr. strio- 
thal., tractus strio-thalamicus; tr. thal. striat., tractus thalamo-striaticus. 
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