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Diagram of relative proportions of three ascending serotonergic pathways in mouse, rat, long‐tailed macaque, and human with squirrel monkey. Diagram is based on separate studies in mouse (Muzerelle et al. 2016), rat and macaque (E. Azmitia and Gannon 1983), squirrel monkey and human (Parent et al. 2011), as well as human alone (Wallman et al. 2011). MLF, medial longitudinal fasciculus; DRCT, dorsal raphe cortical tract; MFB, medial forebrain bundle.
