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  • Title: Afferent projections to the lateral and dorsomedial hypothalamus in a lizard, Gekko gecko.
    Author: Bruce LL, Neary TJ.
    Journal: Brain Behav Evol; 1995; 46(1):30-42. PubMed ID: 7552219.
    Abstract:
    Afferent projections to the lateral hypothalamic area and dorsomedial hypothalamic nucleus of the lizard Gekko gecko were studied after applications of wheat germ agglutinin conjugated to horseradish peroxidase. Large applications into the hypothalamus labeled several telencephalic populations not observed after smaller injections. These included the rostrolateral area of the dorsal cortex, a sheet of cells deep to the caudal pole of the lateral cortex, the external amygdala, and part of the dorsal ventricular ridge. Other populations were labeled in the diencephalon, including the supraoptic nucleus and nucleus ovalis; in the medulla the medial reticular area was labeled. Injections into the lateral hypothalamic area labeled neurons in the rostrolateral dorsal cortex, anterior, lateral, and dorsal septal nuclei, the striatoamygdalar area, nucleus accumbens, vertical limb of the diagonal band, nucleus of the accessory olfactory tract, the interstitial, ventral anterior, and ventral posterior amygdalar nuclei, several hypothalamic nuclei, and the posteroventral thalamic nucleus. Labeled brainstem populations included the ventral tegmental area, torus semicircularis, parvocellular and ventral isthmal nuclei, superior raphe, and the solitary nucleus. Injections in the dorsomedial hypothalamic nucleus labeled neurons in the rostral and caudolateral poles of the dorsal cortex, anterior septal nucleus, horizontal limb of the diagonal band, nucleus of the anterior commissure, several hypothalamic areas, the lateral habenula, the posteroventral thalamic nucleus, and cells scattered around the dorsolateral anterior thalamic nuclei. Labeled brainstem populations included the torus semicircularis, ventral tegmental area, superior raphe, parvocellular and ventral isthmal nuclei, and the lateral dorsal tegmental nucleus. The results of these studies are compared with findings in amphibians and mammals.
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