A–E, Drawings of coronal sections at levels 1.1 mm rostral to 0.3 mm caudal to the calamus scriptorius (CS). Microinjection sites are shown as dark spots; each spot represents a site in one animal (n = 10). Abbreviations: AP, area postrema; CC, central canal; DMNV, dorsal motor nucleus of vagus; nAmb, nucleus ambiguus; NTS, nucleus tractus solitarius; Sp5, spinal trigeminal tract; 4V, fourth ventricle; 12, hypoglossal nucleus.