Neuroanatomical approaches of the tectum-reticular pathways and immunohistochemical evidence for serotonin-positive perikarya on neuronal substrates of the superior colliculus and periaqueductal gray matter involved in the elaboration of the defensive behavior and fear-induced analgesia - Coimbra, Norberto Cysne; De Oliveira, R.; Freitas, R. L.; Ribeiro, S. J.; Borelli, Karina Genaro; Pacagnella, R. C.; Moreira, Jorge Eduardo; Silva, L. A. da; Melo, L. L.; Lunardi, Laurelúcia Orive; Brandão, Marcus Lira (Experimental Neurology, 2006)