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. 2014 May 16;8:34. doi: 10.3389/fnana.2014.00034

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Copyright © 2014 Papp and Palkovits.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Labeled fibers in the periaqueductal central gray (PAG) and the midbrain raphe nuclei following BDA injections into different subregions of the DLH. (A) Drawings for outlining of the corresponding midbrain areas on panels B–F, according to the atlas of Paxinos and Watson (2007), with modifications. (B) Fine BDA-containing fiber network in the lateral and ventrolateral PAG originating from the rostral perifornical area. (C–E) Varicose BDA-containing fibers in dorsal raphe nucleus originating from the rostral (C,D) and caudolateral (E) perifornical area. (F) Moderately dense network of varicose fibers in the paramedian raphe nucleus after injections into the caudolateral part of the perifornical area. Notes: the unilateral BDA-injections were located on the right side. Ipsilateral dominance of labeled fibers can be seen on panels (C–F). Aq, cerebral aqueduct; DpMN, deep mesencephalic nucleus; DR, dorsal raphe nucleus; dscp, decussation of the superior cerebellar peduncle; LP, lateral periaqueductal gray matter; mlf, medial longitudinal fascicle; MnR, median raphe nucleus; PMR, paramedian raphe nucleus; PnO, oral part of the pontine reticular nucleus; Rbd, rhabdoid nucleus; VLP, ventrolateral periaqueductal gray matter. Scale bars: 300 μm.