Abstract
This work is a phase of the general program of study on the diencephalon. The same technic and method of study were used here as were described in the preceding paper.
The preoptic area is so closely associated with the hypothalamus that its nuclei were also studied. The following nuclei were identified : medial, and lateral preoptic nuclei, nucleus paraventricularis preopticus, and nucleus interstitialis pedunculi thalami. These all appear to be homologous to the nuclei of the same name described by Rioch 1 for Carnivora.
The nuclei of the hypothalamus can be arbitrarily divided into 2 main groups, the nuclei of the infundibulum, and those of the mammillary system. The infundibular group will be considered first. Lying along the floor of the infundibulum and above the chiasma are the nuclei ovoideus, tangentialis, and supraoptic difus-sus. The nuclei lying close to or around the hypothalamic ventricle, are the nucleus filiformis, and the nuclei hypothalamicus paraven-tricularis ventralis, dorsalis, and posterior. The nuclei hypothalamicus anterior and parvocellularis lie in the anterior region of the infundibulum and just behind these nuclei are the nuclei hypothalamicus dorsalis, dorsomedialis, ventromedialis, and nucleus perifornicalis. In the posterior portion of the infundibulum, anterior to the mammillary region are the posterior hypothalamic nucleus and the nucleus hypothalamicus ventro-lateralis. Lateral to all of these nuclei and extending nearly the whole length of the infundibulum is the lateral hypothalamic nucleus,
The principal nucleus of the mammillary region is the medial mammillary nucleus. Surrounding this nucleus are the premam-millary, inframammillary, supramammillary, and lateral mammillary nuclei. Just lateral to this group is a well defined nucleus,. the nucleus intercalatus.
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