Descrição morfológica da glândula pineal de Alouatta belzebul

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Universidade Federal de Goiás


The pineal gland in vertebrates produces a hormone, a melatonin, which is related to circadian control and other physiological behavioral functions, such as the reproductive cycle, thermoregulation and thermal tolerance. The present study aimed to describe the morphological, morphometric and histological aspects of the pineal of Alouatta belzebul. Seven brains of adult specimens of this species were studied, of which the location of the gland in relation to the surrounding brain structures was calculated and its length and width were measured. Then, histological slides were prepared and stained with hematoxylin-eosin and PAS. It was observed that the pineal of A. belzebul is located superiorly and cranially to the cerebellum and superiorly to the superior colliculi and below the splenium of the corpus callosum. In addition, it can be functional as subcalous. It had an average length of 2.6 mm and an average width of 1.14 mm. Histologically, the gland is composed of irregular cords of pinealocytes and gliocytes. Pinealocytes pair melanin-like pigments. It was concluded that a pineal gland in Alouatta belzebul has similar aspects with some primates and carnivores, mainly in the su



MASCARENHAS, L. J. S. Descrição morfológica da glândula pineal de Alouatta belzebul. 2021. 82 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2021.