Morfologia das glândulas salivares de Glironia venusta Thomas, 1912 (Didelphimorphia)

Abstract

RESUMO.-O objetivo deste trabalho foi descrever a morfologia das glândulas salivares de Glironia venusta. Foi utilizado um exemplar coletado no resgate de fauna da Usina Hidroeletrica Teles Pires. Este foi fixado com solução de formaldeído a 10%. Para a análise macroscópica, as glândulas foram dissecadas e fotografadas in situ e para a microscopia foram retirados fragmentos das glândulas. Estes foram desidratados em concentrações crescentes de álcool, diafanizados em xilol, inclusos em parafina e corados com HE. G. venusta apresentou as glândulas mandibulares, parótidas, sublinguais, labiais e zigomáticas. As mandibulares se mostraram como estruturas alongadas, constituídas por lobos não septados e localizadas na porção anterior da região cervical. De formato triangular, a parótida estava localizada na depressão do masseter, ventral à cartilagem auricular. As sublinguais encontravam-se ventrais ao ramo da mandíbula, caudais ao digástrico. Foi observado na porção dor- Morfologia das glândulas salivares de Glironia venustaThomas The aim of this study was to describe the morphology of the salivary glands of Glironia venusta. A sample of G. venusta was collected in fauna rescue of hidroelectric usine of Teles Pires was used. This exemplar was fixed with formaldehyde solution 10%. For macroscopic analysis, the glands were dissected and photographed in situ and for the microscopy fragments of the glands were removed, that were dehydrated in increasing alcohol concentrations, diaphanizated in xylene, included in paraffin and stained with hematoxylin and eosin. G. venusta presented the mandibular, parotid, sublingual, labial and zygomatic glands. The mandible is shown as elongated structures, composed of non-septated lobes and located in the anterior cervical region. With a triangular format, the parotid was located in the depression of the masseter, ventral an auricular cartilage. The sublingual were located ventral to the mandible, caudal to the digastric muscle. In the posterior dorsal portion, until the labial commissure, dorsal to the orbicularis muscle of mouth was observed the labial glands, which showed a "U" shape. The zygomatic glands was accompanied the shape of the anterior portion of the zygomatic arch at the infraorbital margin. The mandibulars and sublinguals glands showed acini of mucous type, with some serous acini. The parotid one was made up purely by serous acini. In the labial gland was observed acini of mixed types mixed or seromucosous. Related the zygomatic gland was not possible to perform the microscopic analysis because of histological proceeding problems. Characteristics of the salivary glands observed in G. venusta resemble other omnivores mammals, but showed small differences as regards their location and shape.

Morfologia das glândulas salivares maiores em cutias (Dasyprocta leporina Linnaeus, 1766)

“…A glândula paró-tida da cutia era a maior entre as quatro glândulas salivares maiores identificadas e localizava-se na base da orelha, sendo semelhante ao verificado em Gracilinanus microtarsus (Lobo, 2014). Os resultados definidos para cutias, no que concerne a glândula zigomática, permite inferir que a localização topográfica é correspondente àquela observada em veados por Frey et al (2001) e ainda a aquela descrita por Vieira (2015) em cuíca e a descrição feita por Mohammadpour (2009) ao estudar gatos da raça shorthair. Amano et.…”

Morphology of the major salivary glands of Spix's Yellow‐Toothed Cavys (Galea spixii Wagler, 1831)

“…The zygomatic gland of the Spix's Yellow‐Toothed Cavy is lobulated, with acini of predominantly mucous nature, pyramidal shape cells, and ducts that collect the acinar secretions to a main duct. The characteristics of acini were also defined as large and tubulo‐acinar in some rodent species (Oliveira Júnior et al, 2016; Ribeiro et al, 2007), domestic carnivores (Al‐Gailani et al, 1981; Fossum, 2015), and marsupials (Vieira et al, 2015). This structural organization suggests the relevance of the organ in the production of saliva, as is established for the other major salivary glands.…”

“…Salivary glands act as adjunctive in the digestion processes, facilitating chewing, swallowing, and the beginning of digestion in the oral cavity (Fossum, 2015; Phillips & Tandler, 1987; Vieira et al, 2015). The parenchyma of the salivary glands is formed by the union of a set of spherical or tubular terminal secretory units comprising the acini and a series of branched ducts that release the secreted product in the buccal region (Jaeger & Freitas, 2016).…”

Nocturnal activity and behaviour of the elusive bushy-tailed opossum (Glironia Venusta)

“…Little is known about the ecology and behaviour of G. venusta in the wild, as previous studies are primarily based on opportunistic sightings, individuals in captivity, and from descriptions of morphology of G. venusta (Díaz & Willig 2004, Ardente et al 2013, Nogueira et al 1999, Rossi et al 2010, da Silveira et al 2013, Vieira et al 2015. The species is primarily arboreal but occasionally descends to the ground, as researchers have captured them in pitfall traps (Bernarde & Rocha 2003).…”