Figure 1.
Camera lucida drawings of frontal sections showing the distribution of histamine-immunoreactive neurons (dots, A–C) and those of W-specific, non-W-specific, W/PS-active, SWS/PS-active, SWS-active, PS-specific, Low Rate sleep-specific, and state-indifferent neurons recorded in WT (D–F) or HDC-KO (G–I) mice. 3V, third ventricle; Arc, arcuate nucleus; cp, cerebral peduncle; DM, dorsomedial hypothalamic nucleus; DTM, MTM, and VTM, diffuse, medial, and ventral tuberomammillary nucleus, respectively; f, fornix; LH, lateral hypothalamic area; MM and LM, medial and lateral mammillary nucleus; respectively; mt, mammillothalamic tract; PMD and PMV, dorsal and ventral premammillary nucleus, respectively.