Depiction of GLP-1R-ir cell bodies (green dots) and GLP-1R-ir fibers (red lines) in midbrain sections arranged from rostral (A) to caudal (D). 6N, abducens nucleus; MiTG, microcellular tegmental nucleus; mlf, medial longitudinal fasciculus; Pn, pontine reticular nucleus; scp, superior cerebellar peduncle.