Histologia geral dos intestinos do Caiman crocodilus yacare (Daudin, 1802) (Crocodilia: Reptilia)

Jin, Sonia Maria; Maruch, Sandra Maria das Graças; Rodrigues, Marcos Vinícius; P, Pacheco

doi:10.1590/s0101-81751990000200011

Cited by 9 publications

(30 citation statements)

References 4 publications

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“…Our general histological observations of renal capsule and tubule morphologies agree with previous studies in American alligator (Huber, 1917;Ventura et al, 1989), Yacare caiman (Caiman crocodilus yacare) (Jin et al, 1993), and American crocodile (Crocodylus acutus) kidneys (Davis and Schmidt-Nielsen, 1967). For example, cilia have been observed in the neck segment of crocodile nephrons (Davis and Schmidt-Nielsen, 1967), but not in the alligator (Huber, 1917) or in caiman (Jin et al, 1993).…”

Section: Discussionsupporting

confidence: 91%

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Morphology and Histochemistry of Juvenile American Alligator (Alligator mississippiensis) Nephrons

Moore

Hyndman

Cox

et al. 2009

The Anatomical Record

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Here we present a detailed morphological description of the alligator (Alligator mississippiensis) kidney and nephron. We present a series of histological, histochemical, and immunohistochemical markers that clearly define the seven regions of the alligator nephron. The alligator kidney is composed of many paired (mirrored) lobules on each kidney (lobe). Single nephrons span the width of lobules three times. The fine structure of glomeruli, lying in rows spanning the height of the lobule, is resolved by periodic acid methionine silver (PAMS) and periodic acid Schiff 's (PAS) histochemistry. Glomeruli are connected to the proximal tubule (PT) via a neck segment. The PT is alcian blue-negative, making it distinct from the distal tubule (DT), connecting segment (CS), and collecting duct (CD). The PT is clearly identifiable by a PAS-positive brush border membrane. The PT is connected to the DT via an intermediate segment (IS) that makes a 180 turn to connect these tubules. PAMS-positive material is found in the lumens of the PT, IS, and DT. Also, PAMS-positive granules are found in the DT, CS, and CD. Immunolocalization of the Na þ , K þ -ATPase to the basolateral membrane of the DT, CS, and CD suggests a role of this enzyme in driving primary and secondary transport processes in these segments, including bicarbonate transport into the lumen of the DT (leading to an alkaline urine). Through the techniques described here, we have identified a series of distinct markers to be used by pathologists, veterinarians, and researchers to easily identify alligator nephron segments. Anat Rec, 292:1670Rec, 292: -1676Rec, 292: , 2009. V V C 2009 Wiley-Liss, Inc.Key words: Alligator mississippiensis; kidney; nephron; histochemistry; Na þ , K þ -ATPaseThe kidneys' primary functions, the excretion of nitrogenous wastes and the maintenance of water and ion balance, are achieved through three fundamental mechanisms: glomerular filtration, tubular reabsorption, and secretion. To understand these physiological processes, a description of the morphological structures and kidney cell types is integral. Kidneys from various vertebrate species have been well investigated (Dantzler, 1980;Dantzler and Braun, 1980;Schmidt-Nielsen, 1988;Braun, 1998); whereas, knowledge of the crocodilian kidney is more limited. Previous studies of alligator nephrons have investigated general morphology (Huber, 1917), general nephron composition (Ventura et al.,

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Section: Discussionsupporting

confidence: 91%

“…PT presented a PAS-positive brush border lining the luminal membrane similar to previous observations in alligators (Ventura et al, 1989), caimans (Jin et al, 1993), and crocodiles (Davis and Schmidt-Nielsen, 1967). In contrast, DT did not present a PAS-positive brush border on luminal membranes.…”

Section: Discussionsupporting

confidence: 87%

Morphology and Histochemistry of Juvenile American Alligator (Alligator mississippiensis) Nephrons

Moore

Hyndman

Cox

et al. 2009

The Anatomical Record

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“…In some reptiles the presence of a sphincter or valve was observed between the small and large intestines; for example, Xenodon merremii (Ferri et al, 1976), Cayman crocodilus yacare (Jin et al, 1990), Iguana iguana (Smith et al, 2001) and Chelonia mydas (Magalhaes et al, 2010). At the boundary between the intestines of H. mabouia there is a wall projection that resembles a valve, and most likely controls the passage of digesta.…”

Section: Discussionmentioning

confidence: 99%

“…Previous morphophysiological studies on the gut of reptiles resulted in seven generalizations of the reptilian digestive tract: (1) carnivorous reptiles have a small intestine of greater length than the large intestine, while the opposite occurs in her bivorous reptiles (Zug et al, 2001); (2) the small intestine of reptiles is a long and narrow tube with a few regional differences (Zug et al, 2001); (3) the transition between the small and large intestines is abrupt, marked by the increase in tubular diameter of the large intestine and, sometimes, by presence of a valve (George et al, 1998, Zug et al, 2001; (4) the large intestine of reptiles is composed of the colon, and may also have a caecum at the junction of the intestines (Smith et al, 2001;Mackie et al, 2004;Navega-Gon?alves, 2009); (5) in the small intestine of most reptiles, unlike mammals, there are no villi (Perez-Tomas et al, 1990;George et al, 1998); (6) glandular crypts are absent in both the small intestine and large intestine (Luppa, 1977;Perez-Tomas et al, 1989;Tarak^i et al, 2005); (7) the ep ithelium of the intestinal mucosa of reptiles is simple or pseudostratified columnar, composed of enterocytes, goblet cells, enteroendocrine cells and sometimes Paneth cells (Luppa, 1977;Jin et al, 1990;George et al, 1998). However, it is important to emphasize that reptiles are a polyphyletic group and exhibit a diversity of anatom ical arrangements of their intestinal tract, and what looks like the normal condition for lizards may not be the case for snakes and crocodilians.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is important to emphasize that reptiles are a polyphyletic group and exhibit a diversity of anatom ical arrangements of their intestinal tract, and what looks like the normal condition for lizards may not be the case for snakes and crocodilians. For example, a lot of snakes have villi in the small intestine and no abrupt transition from the small to large intestine (Dehlawi & Zaher, 1989;Jin et al, 1990;Helmstetter et al, 2009). Therefore, the objective of this work was to provide a basic description of the anatomy and histology of the gecko intestine for comparative purposes, and thus provide scientists with the information and description to make accurate generalizations or predictions of the reptilian gastrointestinal morphology.…”

Section: Introductionmentioning

confidence: 99%

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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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Histological organization of intestinal villi in the crocodilian caiman yacare (Daudin, 1802) during dietary lipid absorption

et al. 2018

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Histologia geral dos intestinos do Caiman crocodilus yacare (Daudin, 1802) (Crocodilia: Reptilia)

Cited by 9 publications

References 4 publications

Morphology and Histochemistry of Juvenile American Alligator (Alligator mississippiensis) Nephrons

Morphology and Histochemistry of Juvenile American Alligator (Alligator mississippiensis) Nephrons

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

Histological organization of intestinal villi in the crocodilian caiman yacare (Daudin, 1802) during dietary lipid absorption

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