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. 2002 Jan 15;538(Pt 2):619–631. doi: 10.1113/jphysiol.2001.012888

Figure 1. Distribution of Hcrt-immunoreactive neurons and locations of recorded neurons in the rat PF-LHA.

Figure 1

A, photomicrograph of a representative coronal section through the PF-LHA showing the microwire tracts (long arrows) and Hcrt-1-immunoreactive neurons (short arrows). Scale bar, 100 μm. B, camera lucida drawing of a representative coronal section through the PF-LHA showing the distribution of Hcrt-immunoreactive neurons on the right side (•). The area delineated by the thin line indicates the highest density of Hcrt neurons in PF-LHA regions where neuronal recordings were performed. This area has been reproduced on the left side in B and C to indicate the location of recorded neurons with respect to Hcrt neurons. The locations of Type I wake-related (▴) and Type II wake-related (▵) neurons are plotted on the left side in B. Note that nearly all of the recorded wake-related neurons were localized in or immediately adjacent to the Hcrt-immunoreactive neuronal field. C, camera lucida drawing of the same section depicted in B, showing the distribution of wake/REM-related neurons (○) on the left side and REM-related neurons (*) on the right side. Abbreviations: 3V, third ventricle; f, fornix; opt, optic tract.