Figure 5.

Fos immunoreactivity in the arcuate nucleus (A and I), paraventricular thalamic nucleus (B and J), locus coeruleus (C and K), central gray and dorsal raphe nucleus (D and L), NTS and dorsal motor nucleus of the vagus (10) (E), suprachiasmatic nucleus (F), supraoptic nucleus (G), and paraventricular nucleus (H). Sections shown are from a rat given an intracerebroventricular injection of 30 μg orexin-A (A–H) and one given saline (I–L). Abbreviations: 3v, third ventricle; D3v, dorsal third ventricle; Aq, aqueduct; PaLM, lateral magnocellular division of the paraventricular nucleus. Original magnification (A–D, F–L ×70, E ×35.)