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Abstract:

The lung of the toad, Melanophryniscus stelzneri stelzneri was studied using scanning and transmission electron microscopy. In M.s.stelzneri the parenchyma forms a polygonal network arrangement, therefore the parenchyma is edicular. These spaces are delimited by the interconnection of third order septa which are covered by respiratory epithelium. Small patches of ciliated epithelium without goblet cells appear irregularly distributed on the septa. The respiratory epithelium consists of one type of pneumocyte, which shows characteristics of both type I and type II alveolar cells of higher vertebrates. The pneumocytes are irregular in shape and possess attenuated cytoplasmic processes, which spread around the capillaries to form the outer layer of the air-blood barrier. These cells contain different types of cytoplasmic bodies: electron dense bodies, multivesicular bodies and lamellar bodies. Dense bodies are probably the precursors of lamellar bodies and the multivesicular bodies are incorporated into the latter. Neuroepithelial bodies appear randomly distributed over the septa. These bodies are separated from the lumen of the lung by thin cytoplasmic processes of neighbouring pneumocytes. The air-blood barrier consists of three layers: epithelium, interstitial space and endothelium. The relatively simple pulmonary structure of M.s.stelzneri is due to a lower degree of partitioning of the pulmonary lumen in comparison to the lung of other bufonid anurans, could be correlated with a well developed cutaneous and buccopharingeal respiration. The testing of this hypothesis awaits further studies.

Registro:

Documento: Artículo
Título:Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
Autor:Hermida, G.N.; Farías, A.; Fiorito, L.E.
Filiación:Dpto. de Biodiv./Biol. Experimental, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), Av. Guiraldes s/n, (C1428EHA) Buenos Aires, Argentina
Palabras clave:Amphibian; Electronic microscopic; Lung ultrastructure; Respiratory epithelium; Toad; animal tissue; article; cell ultrastructure; comparative anatomy; controlled study; female; lung alveolus cell type 1; lung alveolus cell type 2; lung parenchyma; lung structure; male; melanophryniscus stelzneri stelzneri; nonhuman; respiratory epithelium; scanning electron microscopy; toad; transmission electron microscopy; Animals; Anura; Lung; Microscopy, Electron; Microscopy, Electron, Scanning; Amphibia; Animalia; Anura; Bufonidae; Melanophryniscus stelzneri; Vertebrata
Año:2002
Volumen:26
Número:3
Página de inicio:347
Página de fin:355
Título revista:Biocell
Título revista abreviado:Biocell
ISSN:03279545
CODEN:BOCEE
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_03279545_v26_n3_p347_Hermida.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p347_Hermida

Referencias:

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Citas:

---------- APA ----------
Hermida, G.N., Farías, A. & Fiorito, L.E. (2002) . Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae). Biocell, 26(3), 347-355.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p347_Hermida [ ]
---------- CHICAGO ----------
Hermida, G.N., Farías, A., Fiorito, L.E. "Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)" . Biocell 26, no. 3 (2002) : 347-355.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p347_Hermida [ ]
---------- MLA ----------
Hermida, G.N., Farías, A., Fiorito, L.E. "Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)" . Biocell, vol. 26, no. 3, 2002, pp. 347-355.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p347_Hermida [ ]
---------- VANCOUVER ----------
Hermida, G.N., Farías, A., Fiorito, L.E. Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae). Biocell. 2002;26(3):347-355.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p347_Hermida [ ]