Recording sites in the MDN. (A) An example photomicrograph (coronal section; approximately 3.6 mm posterior to bregma) showing two electrode tracks (arrows). (B) Reconstruction of electrode tracks. Each solid line denotes one tetrode track. Numbers indicate distances (mm) from bregma. AD, anterodorsal thalamic nucleus; CM, centralmedial thalamic nucleus; CL, centrolateral thalamic nucleus; D3V, dorsal third ventricle; IMD, intermediodorsal thalamic nucleus; LHb, lateral habenular nucleus; LHbL, lateral habenular nucleus, lateral; LHbM, lateral habenular nucleus, medial; MD, mediodorsal nucleus; MDC, central segment of mediodorsal nucleus; MDL, lateral segment of mediodorsal nucleus; MDM, medial segment of mediodorsal nucleus; MDPL, paralaminar segment of mediodorsal thalamic nucleus; MHb, medial habenular nucleus; PC, paracentral thalamic nucleus; PT, paratenial thalamic nucleus; PV, paraventricular thalamic nucleus; PVA, paraventricular thalamic nucleus, anterior; PVP, paraventricular thalamic nucleus, posterior. Modified with permission from Elsevier (Paxinos and Watson, 1998).