title: Anatomical Study of Intrahemispheric Association Fibers in the Brains of Capuchin Monkeys (Sapajus sp.).
abstract: Previous studies suggest that the complexity of fiber connections in the brain plays a key role in the evolutionary process of the primate brain and behaviors. The patterns of brain fiber systems have been studied in detail in many nonhuman primates, but not in Sapajus sp. Behavioral studies indicated that Sapajus sp. (bearded capuchins) show highly cognitive behaviors such as tool use comparable to those in other nonhuman primates. To compare the brain fiber systems in capuchins with those in other nonhuman primates and humans, the intrahemispheric fibers systems in 24 cerebral hemispheres of Sapajus were dissected by a freezing-thawing procedure. Dissection of the hemispheres in lateral view indicated short arcuate fibers, uncinate fasciculus, and inferior longitudinal fasciculus, while that in a medial view indicated short arcuate fibers, the cingulum united with the superior longitudinal fasciculus, and inferior longitudinal fasciculus. The results showed that the fiber systems in Sapajus are comparable to those in rhesus and humans, except for a lack of independent superior longitudinal fasciculus and cingulum in Sapajus.
authors.affiliation: Department of Biology, Academic Areas, Federal Institute of Goiás, 75131-45 Anápolis, GO, Brazil.
authors.forename: Kellen Christina Malheiros
authors.initials: KC
authors.lastname: Borges
authors.affiliation: System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan.
authors.forename: Hisao
authors.initials: H
authors.lastname: Nishijo
authors.affiliation: System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan ; Laboratory of Anthropology, Biochemistry, Neuroscience and Primate Behavior (LABINECOP), Federal University of Tocantins, 77001-090 Palmas, TO, Brazil.
authors.forename: Tales Alexandre
authors.initials: TA
authors.lastname: Aversi-Ferreira
authors.affiliation: School of Medicine, University of Brasília, 70910-900 Brasília, DF, Brazil.
authors.forename: Jussara Rocha
authors.initials: JR
authors.lastname: Ferreira
authors.affiliation: Behavioral Neurology Unit, Hospital das Clínicas, Federal University of Goiás, 74605-020 Goiânia, GO, Brazil.
authors.forename: Leonardo Ferreira
authors.initials: LF
authors.lastname: Caixeta
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002428:Cebus / Q000033:anatomy & histology*; D054022:Cerebrum / Q000033:anatomy & histology* / Q000601:surgery; D006801:Humans; D009412:Nerve Fibers; D009434:Neural Pathways / Q000033:anatomy & histology