Fig. 4.

Distribution of Fos and hypocretinergic neurons during active wakefulness with motor-exploratory activity, quiet wakefulness and REM sleep induced by the microinjection of carbachol into the nucleus pontis oralis. The camera lucida drawing shows the distribution of Hcrt+Fos+neurons. Each mark indicates one labeled neuron. The percentage of Hcrt+Fos+neurons from the total number of hypocretinergic neurons was on average 79% for active wakefulness, 34% for REM-carbachol and 2% for quiet wakefulness [48]. 3V, third ventricle; Fx, fornix.