Contributions to the study of the macroscopy anatomy of Bradypus torquatus (Linnaeus, 1758) and Bradypus variegatus (Schinz, 1825) brain

Abstract

The great preoccupation about the preservation of the south America fauna, have guide researches to a intense productions of the works about them. This work is constitute as a part of this effort to understand the animal structures, in special the gender Bradypus, describing the macroscopic anatomy of the brain in two species, Torquatus and Variegatus, both from the atlantic forest in Brazil. The animals did have a naturally death, were freeze as the standard proceed of the Matinha reserve, the origin of them, and unfreezing, injection, dissection, and colored by the use of appropriate techniques. We observed the neo-cortex formations in a model more primitive than others mammals, a predominance of areas and structures connected to the sense of smell and many differences when compared with other mammals, in especial primates. Among then the occurrence of only two coliculus on the brain trunk, a disk form of the hipophyse, a big fornice, and too development brain peduncles. The circumvolutions are bland and is happen lobos as same to the others mammals with the cerebellum not covered by the projections of the occipital lobos and with proportion until 1/4 in relation to all brain.