230 RALPH EDWARD SHELDON 
pars glandularis (figs. 80, 82). Kappers traces this tract, as was 
previously noted, only as far as the region of the nucleus lateralis 
tuberis, which he fails to identify. 
The ‘‘ Lingsbiindel des grosszelligen Kerns des zentralen Hohl- 
engraues”’ of Goldstein could not be identified with certainty. In 
sagittal sections a few medullated fibers arising from the dorso-lat- 
eral cells of the nucleus magnocellularis could be observed to pass 
caudad, closely associated ventrally with the medial forebrain bun- 
dle as was noted earlier, apparently ending in the nucleus posterior 
tuberis and the nucleus posthabenularis (figs. 136, 140, tr. preopt. 
tub.). Medullated fibers extending latero-caudad as Goldstein 
describes were not found. It is possible, however, that the un- 
medullated fibers of the tractus preoptico-posthabenularis, pars 
anterior may correspond to Goldstein’s tract. 
In addition to its longitudinal and habenular connections, the 
nucleus preopticus possesses a number of important short trans- 
verse, or dorso-ventral connections, all of which are composed of 
unmedullated fibers. Rostrally there are short connections, 
running in both directions between the nucleus parvocellularis 
anterior, and both the nucleus intermedius and nucleus commis- 
suralis lateralis, the tractus preoptico-intermedius, pars anterior; 
intermedio-preopticus, pars anterior; preopticus lateralis; later- 
alis preopticus (figs. 68, 69, 140). Further caudally are found con- 
nections between the nucleus magnocellularis and the nuclei inter- 
medius and entopeduncularis. The nucleus intermedius connec- 
tions include a double tract medially (figs. 72, 137, 140, tr. preopt. 
intermed., pars med. and tr. intermed. preopt., pars med.) and an 
ascending tract passing dorsad, lateral to the lateral forebrain 
bundle, the tractus preoptico-interniedius, pars lateralis (figs. 
69, 72, 137, 140). The short entopeduncular connections are 
shown in figs. 69, 72, 140, tr. preopt. entoped. and tr. entoped. pre- 
opt. Caudally the nucleus parvocellularis posterior and the nu- 
cleus magnocellularis are related to the nucleus posthabenularis 
through ascending fibers to the nucleus posthabenularis from both 
these nuclei, and descending fibers from it to the nucleus parvo- 
cellularis posterior (fig. 140, tr. preopt. posthab., pars ant. and pars 
post. and tr. posthab. preopl., pars ant.). 
