A, schematic representation of the various regions of the VN on adult coronal section of the brainstem. vMVN, ventral part of the MVN; dMVN, dorsal part of the MVN; dLVN, dorsal part of the LVN; vLVN, ventral part of the LVN; SVN, superior VN; IV, fourth ventricle. B-E, brainstem sections at different postnatal (P) days were hybridized using specific oligoprobe for mGluR1 (B and C) and mGluR5 (D and E). Scale bars, 25 µm.