Caracterização microscópica das regiões esofágicas de um grupo de Capivaras (Hydrochoerus hydrochaeris) livres no Brasil

Velásquez, Juan Carlos Carrascal; Bedoya, Sirley Adriana Ortiz; Hernández, Victor Gerardo Petro

doi:10.21615/cesmvz.11.2.6

Cited by 1 publication

(2 citation statements)

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“…The absence of esophageal glands in the submucosal layer of Antillean manatee resembles those of the Amazonian manatee (Colares, 1994) and capybaras (Velásquez et al, 2016), contrasting with what is seen in Asian elephants with abundant mucussecreting glands to protect the esophageal mucous layer, but they have non-keratinized stratified squamous epithelium (Thitaram et al, 2018).…”

Section: Discussionmentioning

confidence: 94%

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Morphological analysis of the digestive tract of Antillean manatee (Trichechus manatus manatus, Linnaeus, 1758) in northeast Brazil

Pinheiro,

Oliveira,

Freire

et al. 2024

Lat. Am. J. Aquat. Mamm.

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Morphological studies of the digestive tract are relevant to know the biology and understand the eating habits to conserve species. Our objective was to analyze macroscopically and microscopically the digestive tract of Antillean manatee (Trichechus manatus manatus). Samples were collected from 20 animals found dead stranded on the coast of northeastern Brazil or that died during the rehabilitation process in captivity between July 1995 and March 2017. The macroscopic analysis of the gastrointestinal tract was carried out from the in loco monitoring of the two necropsies. For microscopic evaluation, tissue fragments were collected during necropsy, fixed with 10% buffered formaldehyde and subjected to routine histological processing, with 5 μm thick slices, and subsequently submitted to the Hematoxylin-Eosin staining method, the Verhoeff method, and the periodic acid-Schiff method. Macroscopically, neonates and adults have the same digestive tract structures, namely esophagus, stomach, duodenum, jejunum, ileum, cecum, colon, and rectum. The microscopic analysis demonstrated that the digestive tract is formed by four histological layers (mucosa, submucosa, muscularis, and serosa or adventitia). In the esophagus, esophageal glands are absent and there are elastic fibers in the submucosal layer and between the external muscle and adventitial layers. The stomach has a structure called the cardiac gland, which microscopically presents ontogenetic differences regarding the depth of the lining epithelium and the orderly distribution of cells along the gastric gland. In the duodenal ampulla and in the diverticula, duodenal glands were identified in the submucosa. The luminal portion of the mucous layer of the cecal ampulla, colon, and rectum is lined by keratinized stratified squamous epithelium. The digestive tract of the species Antillean manatee is similar to what has been reported for the order Sirenia.

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Section: Discussionmentioning

confidence: 94%

“…The aglandular submucosa layer of the esophagus observed in Antillean manatee may indicate the presence of the keratin layer as exclusive protection of the esophageal mucosa (Velásquez et al, 2016) and that the esophagus is an organ that is only related to food conduction to the stomach (Magalhães et al, 2012).…”

Section: Discussionmentioning

confidence: 99%