FIGURE 3.

(A–C) [³H]N-α-methylhistamine binding sites in the cat brainstem. Coronal sections from three representative control and unilateral vestibular neurectomized cats showing decreases in histamine H₃ receptor binding in the different structures of the brainstem on the lesioned side (left side in the figure) 1 (B) or 3 (C) weeks after unilateral vestibular neurectomy, as compared to the controls (A). Illustrations are given for serial sections collected from the rostral (5.2) to the caudal (12.1) parts of the brainstem. IVN, inferior vestibular nucleus; LVNd and v, lateral vestibular nucleus, dorsal and ventral parts; MVN, medial vestibular nucleus; SVN, superior vestibular nucleus; PH, prepositus hypoglossi; DIO, MIO, and PIO, dorsal, medial, and posterior parts of the inferior olive, respectively; SM, medial part of the solitary tract. Bar: 1 mm.