Figure 4.

The specific neuroanatomic areas (A) from which c-Fos immunolabeled nuclei were counted in subdivisions of the caudal vestibular nuclear complex (VNC). Enlargements of the black box in the low magnification image (A) containing the caudal VNC depict unique grid square combinations used to identify ROIs for each subdivision: MVeMC (B), MVePC (C), and SpVe (D). Rectangles in B - D represent superimposed reticules on photomicrographs; grid squares (65 × 65 μm) bounded in red represent regions from which c-Fos counts were taken. For each reticule, letters A - E specify rows and 1 – 6 define the columns (represented in B’). Abbreviations: 4V, fourth ventricle; D: dorsal; ICP: inferior cerebellar peduncle; M: medial; MVeMC: medial vestibular nucleus - magnocellular; MVePC: medial vestibular nucleus - parvocellular; Pr: prepositus nucleus; Rt: reticule (grid overlay defining subdivision configurations); sp5: spinal tract of the trigeminal nerve; SpVe: spinal vestibular nucleus.