Contribuições ao estudo da anatomia macroscópica do encéfalo do Bradypus torquatus (Linnaeus, 1758) e Bradypus variegatus (Schinz, 1825)

Ferreira, Jussara Rocha; Oliveira, Vera Lúcia de; Oliveira, Kleber Mirallia de; Oliveira, Marizane Almeida de

doi:10.11606/issn.1678-4456.bjvras.2005.26397

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…We believe this distinction is related to their functions. The rostral bundle is related with olfaction, thus being more pronounced, whereas the caudal bundle is derived from fibres of the oculomotor nerve, which passes through the roof of the mesencephalon (Ferrari et al, ; Ferreira, Oliveira, Oliveira, & Oliveira, ; Smith, , ; Turner, ).…”

Section: Discussionmentioning

confidence: 99%

Brain anatomy of two‐toed sloth (Choloepus didactylus, Linnaeus, 1758): A comparative gross anatomical study of extant xenarthrans

Freitas

Santos

et al. 2019

Anat Histol Embryol

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The neural system plays an important role in understanding some features of animals. Anatomical complexity correlates with the increase of functional capacity. Xenarthrans include anteaters (Vermilingua), armadillos (Cingulata) and sloths (Folivora). This group is the base of eutherian mammals, and understanding the anatomy of its neural system could provide data for functional and evolutionary interpretations. The gross anatomy of the xenarthran brain is recorded. Four extant families of Pilosa and two families of Cingulata were sampled. Usual dissection procedures were used, and the brains were analysed macroscopically. The brain of two‐toed sloth, three‐toed sloth, six‐banded armadillo, giant anteater and collared anteater are gyrencephalic. Pygmy anteater, nine‐banded armadillo, great long‐nosed armadillo, southern naked‐tailed armadillo and giant armadillo are lissencephalic. In most species, the rhinal fissure presents two segments, rostral and caudal (except in Vermilingua and three‐toed sloth). The diencephalon and brainstem present similar anatomy. The cerebellum is wide and presents four lobes (rostral, central, caudal and floccular). Its average volume is 12.16% (Folivora), 14.26% (Vermilingua) and 18.61% (Cingulata). Among these groups, there is a statistical difference between Folivora/Cingulata concerning the cerebellum average. The general pattern of the brain of the xenarthrans is similar to that of other mammals.

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Section: Discussionmentioning

confidence: 99%

Brain anatomy of two‐toed sloth (Choloepus didactylus, Linnaeus, 1758): A comparative gross anatomical study of extant xenarthrans

Freitas

Santos

et al. 2019

Anat Histol Embryol

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Neuroscience: unveiling the brain of Saimiri collinsi (Squirrel Monkey)

Branco

Sena

Pantoja

et al. 2018

An. Acad. Bras. Ciênc.

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Behavioral intelligence among non-human primates is a somewhat puzzling area to study, since it is closely linked to the morphology of the central nervous system. However, this morphology is still unknown to science in the case of Saimiri collinsi. As a means of assisting future studies on the social behavior of this species, we analyzed the brains of six adult females from the National Primate Center / Pará, which were sent to the Animal Morphological Research Laboratory at the Federal Rural University of Amazônia after death by natural causes. The animals were fixed in formaldehyde solution (10%) and dissected. The brains were covered externally by the dura mater, with long cerebral hemispheres, although there was a complete absence of gyri. The internal structures which form a part of the telencephalon, diencephalon, midbrain, hindbrain and myelencephalon were identified, with the exception of the mammillary bodies. This condition, when linked to the lissencephaly found in these individuals raises questions about the real learning abilities of this species.

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FIRST RECORD OF HEMATOLOGIC VALUES IN FREE-LIVING AND CAPTIVE MANED SLOTHS (BRADYPUS TORQUATUS; XENARTHA, BRADYPODIDAE)

Catenacci¹,

Nascimento²,

Muniz-Neta³

et al. 2017

Journal of Zoo and Wildlife Medicine

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Bradypus torquatus is a rare and endemic sloth species from the Atlantic Forest, Brazil. Due to a lack of medical information including hematologic reference parameters for the species, hematologic baseline values were determined using samples from 14 clinically healthy B. torquatus , under captive (n = 7) and free-living (n = 7) conditions in Bahia State, Brazil. Additionally, the morphology of the blood cells is presented, with a demonstration that the Barr body chromosome may assist with sex determination of the species. The Barr body chromosome was present in all seven females and absent in all males. Many erythrocytes were approximately the size of small lymphocytes, with red blood cells exhibiting anisocystosis, normochromia, and apparent macrocytosis, compared with domestic animals. This study provides the first published hematologic values and cell morphology for B. torquatus . However, further studies are suggested using an automated hematology analyzer with larger sample sizes so that reference intervals may be established and hematologic values better understood for sex, habitat type, and age cohorts.

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Contribuições ao estudo da anatomia macroscópica do encéfalo do Bradypus torquatus (Linnaeus, 1758) e Bradypus variegatus (Schinz, 1825)

Cited by 3 publications

References 4 publications

Brain anatomy of two‐toed sloth (Choloepus didactylus, Linnaeus, 1758): A comparative gross anatomical study of extant xenarthrans

Brain anatomy of two‐toed sloth (Choloepus didactylus, Linnaeus, 1758): A comparative gross anatomical study of extant xenarthrans

Neuroscience: unveiling the brain of Saimiri collinsi (Squirrel Monkey)

FIRST RECORD OF HEMATOLOGIC VALUES IN FREE-LIVING AND CAPTIVE MANED SLOTHS (BRADYPUS TORQUATUS; XENARTHA, BRADYPODIDAE)

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