The nucleus of BELLONCI in birds - DWC

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11 " I/ 1098 -lr. sept"mesenc.. vehtr.ldt. nud. sept-:-hipp. corn. pallii lam. med. dors. sept. tr. archish .. hab6pr4etorn. h. cort-:hab.lat. nnt. ntos\:r. palaeosh augrn. /I prlm. ~ii1ii~~~?::" tr: oc.t-:n!esene. ~~~~,;:.-;..;!,- tr. sel"V:lt'\u.ram.ci. ir. i nte'rst'~h'fD01;1t:' nuel. ,"terst. st.r. term. nut!. 8elio"c.i i~thrn~ol't. tlucl.periv. 1Tl . pr: " 4 11 eet'. hlenc.lat. p.dors. fr. stde[rn. ~ ce" "uel. ge.n.lat. vent.,.. +qvinv.front. +setlt:-mes.r.b.C. . olf7hab. lai:. ir. i "fun nucl. dec.. 5uprdoptdor.s. ve"h. te,.4:. Fig. 5. neostr. ',tiiP+':"7"ë'-' raid e 0 st r. au gm. 11 .prll,". co 1'>11". se~t7Il1e5 . sir."'. """" ~>..- tr: OCC;-01es. ,=,:.;.".;;".,. ,!;i!ol! .. ~';;- tr. i.,ter5t-: hypothaI. tr. sept:-me.s. ram. d. " ~ /1 4CC . vel1tr. ht! . isth.,.,,,opt. raSt. telet1dat.p_ dors. MUel. g-en.lat. vent!: r. olfohab.\ ... t. nvd. dec. 5upraopt. dors. nvd. periv. m. p Fig. 6. Figs. 5 and 6. DOVE. Cross-sections through hindmost part of nucleus of BELLONCI and beginning of stria medulla ris, fig . 6 some sections behind fig . 5. WEîOERT-PAL-paracarmine. X 8.
1099 by H UBER and CROSBY (their component from septo-mesencephalic system to habenula). The tractus oHacto-habenularis lateralis is not reported here for thc first time for birds, it was described in them long ago as tractus striohabenularis by MÜNzER and WIENER (1898) and EDINGER and W ALLEN BERG (1899). Also KAPPERS and THEUNISSEN (1908) mention th is bundIe. Medial to the nucleus of BELLONCI and coextensive with its caudal haH lies a cell mass, which is closely applied to the dorsal peduncle of the lateral forebrain bundIe (figs. 5, 6). At its beg inning it only covers the lateral aspect of the lateral forebrain bundIe, but gradually it expands medially so as to cover this bundIe dorsolaterally too. Also in the sparrow this nucleus is present, but here it lies farther backward (fig. 7). No doubt this is the crusta peripeduncularis of EDrNGER and W .ALLENI3ERG (1899), which cell mass is only referred to of later authors by GROERBELS (1924), who in the dove and chick is inclined to identify it with his geniculatum laterale tertium anterius 1) and by RENDAHL (1924, p. 315), who could not find it in the chick. It may be the same as the bed nucleus of the tractus thalamo-frontalis medialis of HUBER and CROSBY (1929, p. 89). I suppose this cell group to be the interstitial nucleus of the stria terminalis 2), on the ground that it occupies exactly the same position relative to the lateral forebrain bundIe and nucleus of BELLONCI as the latter does in crocodilians (compare figs. 5 and 6 of the dove with fig. 2d. of Crocodilus porosus in the previous paper). We shall now put forward our arguments for regarding the nucleus lateralis anterior of birds as the homologue of the nucleus of BELLONCI of amphibians, reptiles, and mammals. In the first place the position of the two nuclei is quite similar, both being situated in the foremost part of the thalamus, dorsal to the oral extremity of the ventral lateral geniculate, with the restriction, however, that in anures the nucleus of BELLONCI has shifted rather caudad along the dorsal side of the lateral geniculate (AODENS, 1938, fig. 1). In mammals the nucleus of BELLONCI occupies its usu al rostral position, hut here the lateral genicuJate has shifted caudad, so that there is a gap between these nuclei. As to the development of the nuclei, we are comparing, the nucleus of BELLONCI is known to arise from the ventral thalamus (see ADDENS, 1938). About the development of the nucleus lateralis anterior of birds RENDAHL (1924) and KUHLENHECJ( (1937) unfortunately are at variance. According to RENDAHL (1924), in the chick this nucleus splits oH from the foremost 1) This is not correct. Both in the dove and chick the crusta peripeduncularis lies farther forward and more medially than GROEBBELS' geniculatum laterale tertium anterius. In my opinion the latter is the foremost dorsal part of the tectal gray of HUB'ER and CROSBY (1929). 2) In the previous paper, following CAIRNEY (1926) for Sphenodon, I labelled th is nucleus as the interstitial nucleus of the tractus amygdalo-praeopticus. 71*
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The nucleus of BELLONCI in birds - DWC

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