PLATE 8 
EXFLANATION OF FIGURES 
35 Transection through the hemispheres at the rostral margin of the anterior 
commissure. Weigert method. > 17. This section shows particulaily the de- 
cussation of the nervus terminalis (see also Sheldon ’09, figs. 6 and 7); also the 
commissura dorsalis, partly made up of fibers connecting the two partes stpra- 
commissurales of the precommissural body, partly of fibers connecting the two 
nuclei olfactorii dorsales (commissura hippocampi, pars anterior). The relaticn 
of the corpus precommissurale to the anterior commissure is brought out cleaily, 
the pars commissuralis or commissure bed of Elliot Smith appearing ventrally 
and the pars supracommissuralis dorsally. 
36 Transection through the middle of the anterior commissure. Weigert 
method. 17. Shows especially the decussation of the tractus strio-thalamicus 
cruciatus and of the tractus olfactorius medialis, pars lateralis; also the commis- 
sura hippocampi, pars posterior, presenting points of similarity, morphologically, 
with the commissura dorsalis of Elliot Smith in amphibians, reptiles and mammals, 
the commissura pallii of Kappers and Theunissen in amphibians, the commissura 
pallii posterior of Edinger in reptiles, the commissura olfactorii internuclearis of 
Goldstein, and connecting the nuclei pyriformes of the two sides. This section 
also brings out several of the components of the medial forebrain bundle, the trac- 
tus olfacto-lobaris medialis of Kappers (’06). Dorsally, mingled with the fibers 
of the commissura dorsalis are the fibers of the tractus hypothalamo-olfactorius 
medialis. These are ascending fibers, part of which decussate in the anterior 
commissure and part in the region of the nucleus posterior tuberis (see figs. 102, 
104, 105). This is the tractus olfacto-hypothalamicus medialis of Goldstein. 
com. ant., Commissura anterior; com. dors., commissura dorsalis; com. dors.+ 
dec. tr. hyp. olf. med., commissura dorsalis plus decussatio tractorum hypo- 
thalamo-olfactoriorum medialium ; com. hipp., pars post., commissura hippocampi, 
pars posterior; com. interbulb. (tr. olf. med., pars. med.), commissura interbulbaris 
(tractus olfactorius medialis, pars medialis, the fibers of the tract forming the com- 
missurainterbulbaris (aut); corp. precom., pars com., corpus precommissurale, pars 
supracommissuralis; dec. tr. olf. med., pars lat., decussation of the tractus olfac- 
torii mediales, partes laterales; dec. tr. strio-thal. cruc., decussation of the tractus 
strio-thalamici cruciati; n. olf. lat., nucleus olfactorius lateralis; . opt., nervus 
opticus; 7. pyr., nucleus pyriformis—this, together with a part of the nucleus olfac- 
torius lateralis, corresponds to the lobus olfactorius posterior or area olfactoria 
posterior lateralis of Kappers (06), the lobus olfactorius posterior, pars lateralis 
of Goldstein, the lobus olfactorius of Edinger (08), the area olfactoria lateralis 
of Kappers and Theunissen; 7. term., nervus terminalis; palaeostr., palaeostria- 
tum;s.lim.tel., sulcus imitans telencephali; s. ypsil., fur. ant., suleus ypsiliformis, 
furea anterior; tr. hyp. olf. med., tractus hypothalamo-olfactorius medialis; (r. 
olf. lat., tractus olfactorius lateralis; tr. olf. med., pars. lat., tractus olfactorius 
medialis, pars lateralis; tr. olf. thal. med., pars vent., tractus olfacto-thalamicus 
medialis, pars ventralis—this latter component of the medial forebrain bundle is 
descending and made up of uncrossed fibers (see fig. 136), which, with the pars 
intermedia, and pars dorsalis, form the tractus olfacto-lobaris medialis or tractus 
olfacto-hypothalamicus medialis of Kappers; lr. strio-thal., tractus strio-thal- 
‘imicus. 
270 
