PLATE 19 
EXPLANATION OF FIGURES 
76 Transection through the ganglia habenularum. Weigert method. 17. 
77 Transection at the level of the commissura horizontalis. Weigert method. 
x ite 
a, fibers, originating largely in the nucleus posthabenularis and apparently 
entering the optic tract (described as an optic connection by Bela Haller); com. 
hab., commissura habenularis, containing also decussating fibers of the two tractus 
olfacto-habenulares; com. Herrick, commissura Herricki; com. horiz., commissura 
horizontalis of Fritsch; com. trans., commissura transversa; corp. gen. lat., corpus 
geniculatum laterale; fasc. lat. hem. <-—, fasciculus lateralis hemisphaerii; fasc. 
med. n. opt., fasciculus medialis nervi optici; fasc. retr., fasciculus retroflexus ; 
fib. tect. n. opt., fibrae tectales nervi optici (centrifugal); hab., habenula; lob. inf., 
lobus inferior; nucl. preopt., pars parvocell. post., nucleus preopticus. pars parvo- 
cellularis posterior; nucl. prerot., nucleus prerotundus; nucl. vent. tub., nucleus 
ventralis tuberis; tr. hab. dien .<——, tractus habenulo-diencephalicus; this is the 
‘tractus habenula ad diencephalon’ of Goldstein; tr. hyp. olf. med., tractus hypo- 
thalamo-olfactorius medialis; ¢r. olf. hab., tractus olfacto-habenularis; tr. olf. 
thal. med., pars dors., tractus olfacto-thalamicus medialis, pars dorsalis; tr. olf. 
thal. med., pars intermed. <—-—, tractus olfacto-thalamicus medialis, pars inter- 
media; tr. olf. thal. med., pars vent., tractus olfacto-thalamicus medialis, pars ven- 
tralis; tr. opt., tractus opticus; tr. praeth. cin., tractus praethalamo-cinereus. 
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