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FIGURE 4–7. Brightfield photomicrograph of a coronal section through macaque monkey brain illustrating the distribution of cannabinoid CB1 receptor–immunoreactive axons.Association areas such as the cingulate cortex (area 32), insula (Ig, Idg), auditory association cortex (RP), and entorhinal cortex (EI) have an overall higher density of CB1-immunoreactive axons than do primary somatosensory areas (areas 3, 1, 2) and primary motor cortex (area 4). Note the distinct differences in laminar distribution of labeled processes at the boundaries of some cytoarchitectonic regions (arrows). In subcortical structures, the intensity of CB1 immunoreactivity is high in the claustrum (Cl), the basal and lateral nuclei of the amygdala, and both segments of the globus pallidus (GP); intermediate to low in the caudate (Cd) and putamen (Pu) and the central and medial nuclei of the amygdala; and not detectable in the thalamus (Th). Scale bar = 2 mm. ABmc = accessory basal nucleus, magnocellular division; ABpc = accessory basal nucleus, parvicellular division; Bi = basal nucleus, intermediate division; Bmc = basal nucleus, magnocellular division; Bpc = basal nucleus, parvicellular division; CC = corpus callosum; Cd = caudate; Ce = central amygdaloid nucleus; Cgs = cingulate sulcus; Cl = claustrum; COp = posterior cortical nucleus; cs = central sulcus; EI = entorhinal cortex, intermediate field; GPe = globus pallidus, external; GPi = globus pallidus, internal; Idg = insula, dysgranular; Ig = insula, granular; ips = intraparietal sulcus; Ldi = lateral nucleus, dorsal intermediate division; lf = lateral fissure; Lv = lateral nucleus, ventral division; Lvi = lateral nucleus, ventral intermediate division; Me = medial amygdaloid nucleus; PN = paralaminar nucleus; Pu = putamen; R = rostral auditory area (core primary auditory); rf = rhinal fissure; RM = rostromedial auditory belt; RP = rostral auditory parabelt; SII = second somatosensory cortex; sts = superior temporal sulcus; TE = inferotemporal cortex; Th = thalamus; TPO = temporal parieto-occipital associated area in sts.Source. Reprinted from Eggan SM, Lewis DA: "Immunocytochemical Distribution of the Cannabinoid CB1 Receptor in the Primate Neocortex: A Regional and Laminar Analysis." Cerebral Cortex 17:175–191, 2007. Copyright 2007, Oxford. Used with permission.


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