Case pg351, fig5a-e. 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 Terminal label evident throughout the anteroventral preoptic nucleus..

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The rhomboid and ventral nuclei of the BST contain a moderate plexus of PHAL-labeled axons with rich terminal axons... Collator note: Atlas level 20, Swanson 1998. Possible fibers of passage. Figure 6H from the paper.

The rhomboid and ventral nuclei of the BST contain a moderate plexus of PHAL-labeled axons with rich terminal boutons, whereas the rest of the BST contains only scattered fibers-of-passage (Fig. 6H,I). Collator note: Atlas level 21, Swanson 1998. Fibers of passage are present. Figure 6I from the paper.

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...at medial preoptic levels scattered PHAL-labeled axons with terminal boutons and boutons-of-passage extend medially into the lateral preoptic area (Fig. 4J) and the immediately adjacent rostral tip of the lateral hypothalamic area (Fig. 4K).

...near the caudal end of the substantia innominata a distinct bundle of axons turns medially to enter the lateral hypothalamic area (Fig. 4M).

After branching and generating terminal boutons in this restricted zone of the lateral hypothalamic area [adjacent region to the substantia innominata], the fibers appear to travel caudally through ventrolateral regions of the lateral hypothalamic area, between the cerebral peduncle and optic tract, where they also branch and generate boutons (Fig. 4M-Q).

Just caudal to the paraventricular nucleus many labeled fibers from the BSTrh extend medially from the medial forebrain bundle to innervate densely a restricted dorsal region of the perifornical lateral hypothalamic area, essentially between the zona incerta and fornix (Figs. 4O,P, 7C).

Two other terminal fields from the BSTrh were observed in the hypothalamic tuberal region. One terminal field is centered in the tuberal nucleus and a dorsally adjacent, circumscribed region of the lateral hypothalamic area, ventrolateral to the fornix (Figs. 4N–R, 7C).

The other terminal field [collator note: see page 455] lies in the ventrolateral corner of the lateral hypothalamic area, just medial to the cerebral peduncle and optic tract (Figs. 4O-Q, 7C).

...the majority of descending fibers in far lateral regions of the medial forebrain bundle display few boutons—until they reach the general region containing the parasubthalamic nucleus of Wang and Zhang (1995). This tiny, though distinct, cell group lies around the medial tip of the caudal end of the subthalamic nucleus (centered on level T of Fig. 4, but extending onto level S), and a large majority (the exact percentage is currently unknown) of its neurons express substance P (see Goto et al., 2000). PHAL-labeled axons descending through the medial forebrain bundle generate a terminal plexus in and immediately surrounding the parasubthalamic nucleus that is so dense (Figs. 2C, 4R–T) it can be observed easily with the naked eye in the relevant tissue sections. Ventrolateral regions of this terminal field merge with the more rostral, much more restricted terminal field in the ventrolateral lateral hypothalamic area mentioned above (at levels O–Q of Fig. 4). Just caudal to the parasubthalamic nucleus, this massive terminal field essentially disappears (Fig. 4U,V). Collator note: this nucleus does not appear in the rat brain nomenclature Swanson 1998, therefore we assigned this label to the ventrolateral quadrant of the lateral hypothalamic area.