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. 2017 Jan 4;117(3):1200–1214. doi: 10.1152/jn.00836.2016

Fig. 2.

Fig. 2.

Brain injection and recording sites. A: stimulation sites within the secondary somatosensory cortex (S2). B: recording and injection sites in the rostral ventromedial medulla (RVM). In A, circles = sham-operated rats, squares = hypersensitive spinal nerve-ligated (SNL) rats, stars = nonhypersensitive SNL rats, asterisks = stimulation site outside S2 in hypersensitive SNL rats. In B, squares = recording sites in hypersensitive SNL rats, triangles = recording sites in hypersensitive SNL rats. S1, primary somatosensory cortex (orofacial area); S2, secondary somatosensory cortex; GI, granular insular cortex; RMg, raphe magnus nucleus; GiA, gigantocellular reticular nucleus alpha; Contra, contralateral to the operated and tested hind limb; Ipsi, ipsilateral to the operated and tested hind limb. Each symbol represents one to two rats. Numbers represent distances in millimeters from interaural line (IA). In both graphs, photos demonstrate examples of brain slices stained with hematoxylin and eosin; arrows point to a stimulation site in A and recording site in B. [Adapted from Paxinos and Watson (1998) with permission. Copyright Academic Press].