Histaminergic innervation of thalamic trigeminovascular neurons.

<p><u>Left</u>: Immunopositive Histamine axons (green) surrounding a thalamic dura-sensitive neuron (red) labeled with TMR–dextran. Nuclear counterstaining was performed with DAPI (blue). Arrowheads indicate close apposition of Histamine positive axons and the cell body and dendrites of the labeled neuron. <u>Upper right</u>: Location of the dura-sensitive neuron (red star) shown at left. Number in red indicates distance from <i>bregma</i> (mm). <u>Lower right</u>: Fluorescent image showing Histamine labeling of cell bodies in the dorsal and ventral tuberomammillary nuclei of the hypothalamus (DTM and VTM). Scale bars = 100 µm.