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..

light caudally

Caudal to the diencephalon, substantial retrograde labeling was found in the PAG [...]. Remarkably, in the PAG, we noted that the distribution pattern of retrogradely labeled cells changed along its rostrocaudal axis (Fig. 3N–P). Thus, at the level of the nucleus of Darkschewitsch, most of the retrograde labeling was distributed in the dorsomedial PAG (Fig. 3N). Proceeding caudally, at the level of the oculomotor and trochlear nuclei, a distinct cluster of marked neurons was found in the dorsolateral PAG, whereas other parts of the PAG contained relatively sparse numbers of marked neurons (Fig. 3O). In contrast, at caudal levels of the PAG, retrogradely labeled neurons were distributed more evenly throughout the lateral, ventrolateral, dorsomedial, and dorsolateral parts of the PAG (Fig. 3P). Collator note: level 39, Swanson Atlas, 1998.

At the anterior hypothalamic level, ascending fibers coursing through the hypothalamus supply dense inputs to the anterior hypothalamic nucleus, subparaventricular zone, rostral retrochiasmatic area, and perifornical region of the lateral hypothalamic area in addition to a relatively sparse input to the other regions of the lateral hypothalamic area (Figs. 5D–G, 6B).

At the anterior hypothalamic level, ascending fibers coursing through the hypothalamus supply dense inputs to the anterior hypothalamic nucleus, subparaventricular zone, rostral retrochiasmatic area, and perifornical region of the lateral hypothalamic area in addition to a relatively sparse input to the other regions of the lateral hypothalamic area (Figs. 5D–G, 6B).

At the anterior hypothalamic level, ascending fibers coursing through the hypothalamus supply dense inputs to the anterior hypothalamic nucleus, subparaventricular zone, rostral retrochiasmatic area, and perifornical region of the lateral hypothalamic area in addition to a relatively sparse input to the other regions of the lateral hypothalamic area (Figs. 5D–G, 6B).

Proceeding rostrally, large numbers of fibers from the PRC reach the preoptic region, where they appear to provide a dense input to the lateral preoptic area in addition to a sparse input to the anteroventral preoptic nucleus (Fig. 5B,C).