Histologia do antro pilórico de Caiman crocodilus yacare (Crocodilia - Reptilia)

Jin, Sonia Maria

doi:10.1590/s0101-81751988000200002

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…The characteristics found in the stomach of G. microtarsus resemble those described in dogs (Banks, 1992). The muscular layer showed to be thicker in the pyloric region in relation to the same layer of the fundic region, as described by Jin (1988), in Caiman crocodillus yacare. Cáceres (2005) in his comparative study in marsupials Didelphidae describes that the stomach undergoes variations according to the food habit of the species.…”

Section: Discussionsupporting

confidence: 66%

Tissue analysis of Brazilian gracile opossum digestory tube (Gracilinanus microtarsus Wagner, 1842) (Marsupialia: Didelphidae)

Lobo¹,

Santos²,

Rosa³

et al. 2018

Braz. J. Biol. Sci.

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The alimentary habit reflects in the morphology of digestive organs. In this sense, microscopic studies are useful to analyze the tissue composition of each organ and allow greater comparisons with other marsupials described in the literature. For this reason, the aim of this study was realize a microscopic description of the digestive tube in Gracilinanus microtarsus Wagner, 1842 (Marsupialia: Didelphidae). Six adults specimens were used (3 males and 3 females). Samples from organs of digestive tube were fixed in 10% folmaldehyde solution. The samples were dehydrated in increasing concentrations of ethanol (70%-100%), diaphanized in xylol, paraffin-embedded, cut into a microtome and stained by H. E., Picrossirius, Schiff periodic acid, Toluidine Blue and Masson’s Trichrome. The material was analyzed and photographed through a Nikon Eclipse E-400 Photomicroscope. This study demonstrated, for the first time, the histological constitution of the digestive tube of G. microtarsus. It has been demonstrated that the digestive tube is formed by the esophagus, stomach, small intestine (duodenum, jejunum and ileum) and large intestine (cecum, colon and rectum). These organs were constituted by five distinct layers, a serosa coating externally the organ, a muscular, a submucosa, a muscular of the mucosa, and a mucosa with epithelium that varied between squamous keratinized in the esophagus to prismatic-type in the other organs. This study demonstrated that the digestive tube of animals studied is similar to that described in other marsupials Didelphidae described in the literature with the same food habit. Future immunohistochemical studies may demonstrate the enzymatic complex involved in digestion and the cellular and molecular mechanisms involved in the uptake of nutrients by the digestive tube in this species.

show abstract

Section: Discussionsupporting

confidence: 66%

Tissue analysis of Brazilian gracile opossum digestory tube (Gracilinanus microtarsus Wagner, 1842) (Marsupialia: Didelphidae)

Lobo¹,

Santos²,

Rosa³

et al. 2018

Braz. J. Biol. Sci.

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“…This feature is common for the reptiles, Uromastyx philibyi [13] and Pristurus rupestris [14]. The esophagus of the crocodile C. crocodilus yacare [15] and C. latirostris [16] has longitudinal folds in the esophageal mucosa.…”

Section: Discussionmentioning

confidence: 99%

“…However, the middle and caudal portions are formed of very complicated folds [17]. This folds are totally distensible, to enable expansion of the esophagus, allowing it to store food that is ingested [15].…”

Section: Discussionmentioning

confidence: 99%

Ultrastructural Study of the Alimentary Tract of Two Reptilian Species the Lizard Scincus scincus and the Snake Natrix tessellata

Abdeen¹

2014

J Cytol Histol

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The ultrastructural difference of the alimentary tract of the insectivore, Scincus scincus and the carnivore, Natrix tesstellata was described by using scanning and transmission electron microscopy. The oesophagus of S. scincus with many prominent longitudinal folds while in N. tessellata it has many primary longitudinal folds and secondary ramification. The oesophageal epithelium of both species has numerous goblet cells. The mucosal epithelial cells in both species contain large nucleus, endoplasmic reticulum, lysosomes and some vacuoles. Stomach had a meshwork of primary folds in S. scincus and it forms various folds forming many discrete, irregular pockets in N. tessellata. The mucosal cells in the stomach of S. scincus have many secretory granules while in N. tessellate it provided with numerous mucinogen granules in the gastric columnar cells. In S. scincus, the intestinal mucosa with many primary folds but it appeared as longitudinal secondary mucosal folds in ZigZag pattern enclosing a number of concavities in N. tessellata. The intestinal mucosal cells in both species consisted of regularly formed microvilli. There were numerous goblet cells in the intestine of both species. In conclusion, structural variation of the alimentary tract in the two species examined was related to difference in feeding habits.

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Functional morphology of the gut of the tropical house gecko Hemidactylus mabouia (Squamata: Gekkonidae)

et al. 2014

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The purpose of this study was to characterize morphophysiological aspects of the gut of the gecko Hemidactylus mabouia, a predator species of tiny arthropods. Fourteen adult specimen of the gecko H. mabouia were euthanized and fragments of their small and large intestines were collected and processed according to routine methods for anatomical, topological, histological and histochemical analyses. Histological sections were stained with toluidine blue or submitted to techniques for identifi cation of argyrophil and argentaffin endocrine cells, glycoconjugates and alkaline phosphatase activity. The small intestine of H. mabouia is much more extensive and convolute than the large intestine. There are subtle regional differences along the small intestine, as the tubule diameter and height of the inner folds noticeably decrease from the proximal toward the distal segment. There is no caecum between the small and large intestines and the abrupt change in the caliber marks the transition of the small in testine into the large intestine. The large intestine consists of a very dilated proximal segment followed by a short distal segment. The villi are absent, but the tall folds in the internal covering of the small intestine constitute important amplifier structures of the digestive and absorptive area. No mucosal or submucosal glands were observed along the intestine. The epithelial fining of the entire intestine is simple columnar with enterocytes, mucus-secreting cells and endocrine cells. The enterocytes are abundant in the small intestine and the mucus-secreting cells are abundant in the large intestine, which reflects the functional role of these organs. In sum, H. mabouia has small intestine that is longer than the large intestine, which is consistent with the species being a carnivorous reptile.

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Histologia do antro pilórico de Caiman crocodilus yacare (Crocodilia - Reptilia)

Cited by 4 publications

References 1 publication

Tissue analysis of Brazilian gracile opossum digestory tube (Gracilinanus microtarsus Wagner, 1842) (Marsupialia: Didelphidae)

Tissue analysis of Brazilian gracile opossum digestory tube (Gracilinanus microtarsus Wagner, 1842) (Marsupialia: Didelphidae)

Ultrastructural Study of the Alimentary Tract of Two Reptilian Species the Lizard Scincus scincus and the Snake Natrix tessellata

Functional morphology of the gut of the tropical house gecko Hemidactylus mabouia (Squamata: Gekkonidae)

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