Case pg352. Soma notes 36 female Sprague-Dawley rats weighing 200-350g. 10 microliters of CT-HRP(.20%-.40%) were injected into one eye ?behind the lens into the vitreous chamber of the eye. pressure injection over 1 min. Terminal notes Med. component of the RHT?in addition, labeled fibres and terms were found lateral to the lateral boundary of the SCN, in the lateroanterior hypothalamic nucleus. Lat component diffuse labeling in the lateroanterior hypothalamic nucleus was evident.

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...at the anterior hypothalamic level, the rostral pole of the anterior hypothalamic nucleus presented a dense cluster of retrogradely labeled cells distributed in a region that seems to overlap with a territory known to contain large numbers of neurons expressing enkephalin (Harlan et al., 1987), whereas the caudal two-thirds of the nucleus contained relatively sparse numbers of marked cells (Fig. 3D–I).

...at the anterior hypothalamic level, the rostral pole of the anterior hypothalamic nucleus presented a dense cluster of retrogradely labeled cells distributed in a region that seems to overlap with a territory known to contain large numbers of neurons expressing enkephalin (Harlan et al., 1987), whereas the caudal two-thirds of the nucleus contained relatively sparse numbers of marked cells (Fig. 3D–I).

...the BST appear to receive a very sparse input; most of the labeled axons here lie in the transverse and interfascicular nuclei.

Several BSTtr axons also generate a nearby terminal plexus in a dorsomedial region of the lateral hypothalamic area between the fornix and anterior parvicellular part of the paraventricular nucleus (Fig. 6G–J).

Descending BSTtr axons in the ventral pathway generate a few branches and boutons in the retrochiasmatic area (Fig. 6J–L) before arching dorsomedially to provide a dense, vertical terminal field in a restricted zone of the lateral hypothalamic area between the fornix and tuberal nucleus at the level of the ventromedial nucleus (Fig. 6N–R).

[...] many PHAL–labeled BSTtr axons that course through the BSTif, BST ventral nucleus, and caudal substantia innominata enter rostromedial regions of the lateral hypothalamic area (Fig. 6I,J), where they display some branching and boutons.

At the level of the dorsomedial nucleus many axons in the medial forebrain bundle turn medially and generate a rich terminal field in a restricted suprafornical region of the lateral hypothalamic area between the zona incerta and fornix that extends medially into the anterior part of the dorsomedial nucleus (Figs. 6O–P, 7D'').