FIG. 1.
A) Illustration of microdialysis probes placement in the medial preoptic area. The diagram corresponds to a coronal section at approximately 0.0 mm relative to Bregma according to the atlas of Paxinos and Watson [55]. MPA, Medial preoptic area; 3V, third ventricle; och, optic chiasm; VMPO, ventromedial preoptic nucleus; VLPO, ventrolateral preoptic nucleus; AVPe, anteroventral periventricular nucleus; SO, supraoptic nucleus; Al, alar nucleus; StA, strial part preoptic nucleus; OVLT, organum vasculosum lamina terminalis. Black circles indicate young rats; black squares, middle-aged rats. B) Photomicrograph of thionin-stained coronal section showing the approximate location of a microdialysis probe. The arrow indicates the site of probe placement (original magnification ×4).