. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 648 terminating in the preoptic recess. Three sulci pass backward from the interventricular foramen (F). The sulcus diencephalicus dorsalis is divided into two parts, the anterior one of which forms the sub- habenular sulcus, while the posterior one bounds an undifferentiated post-habenular region which probably also belongs to the epithalamus. The sulcus diencephalicus ventralis separates the thalamus above from the nucleus preopticus (which is very large in the Amphibia) and the hypothalamus. The preoptic nucleus is bounded
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 648 terminating in the preoptic recess. Three sulci pass backward from the interventricular foramen (F). The sulcus diencephalicus dorsalis is divided into two parts, the anterior one of which forms the sub- habenular sulcus, while the posterior one bounds an undifferentiated post-habenular region which probably also belongs to the epithalamus. The sulcus diencephalicus ventralis separates the thalamus above from the nucleus preopticus (which is very large in the Amphibia) and the hypothalamus. The preoptic nucleus is bounded in front by a vertical sulcus which closely follows the caudal border of the anterior com- /. 5_accas dorsalis . nc h. pars '.c~p'ä ' '^" '^'^- "^'^^ ? n po. pars m . ^— pars ant. -? ''•optic chiasma Fig. 3. Graphic reconstruction of the median view of the left half of the brain of adult Amblystoma tigrinum after section in the sagittal plane. The line A—B marks the plane of section in Fig. 2. eommissura anterior, commissura posterior, comraissura superior, commissura pallii anterior. F. foramen interventriculare. nucleus of commissura hippocampi (this is Gaupp's nucleus supracommissuralis of the frog). ant. nucleus preopticus, pars anterior, m. nucleus preopticus, pars magnocellulaiis. P. paraphysis. pars dors. thai, pars dorsalis thalami. ^^ars t^e?;. <Äa?. pars ventralis thalami. sulcus interencephalicus anterior of Kupffek. sulcus subhabenularis (anterior part of sulcus diencephalicus dorsalis). zona limitans medialis, or ventral boundary of primordium hippocampi. missure ridge. This is the ventral end of Kupffer's sulcus inter- encephalicus anterior. The preoptic nucleus is divided into anterior and posterior parts by a similar vertical sulcus farther back. The posterior part is homologous with the nucleus magnoce
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