Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)

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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 se...

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Autores principales:	Hermida, G.N., Farías, A., Fiorito, L.E.
Formato:	Artículo publishedVersion
Lenguaje:	Inglés
Publicado:	2002
Materias:	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 Bufonidae Melanophryniscus stelzneri Vertebrata
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03279545_v26_n3_p347_Hermida
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paperaa:paper_03279545_v26_n3_p347_Hermida
record_format	dspace
spelling	paperaa:paper_03279545_v26_n3_p347_Hermida2023-06-12T16:47:40Z Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae) Biocell 2002;26(3):347-355 Hermida, G.N. Farías, A. Fiorito, L.E. 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 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. Fil:Hermida, G.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03279545_v26_n3_p347_Hermida
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language	Inglés
orig_language_str_mv	eng
topic	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
spellingShingle	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 Hermida, G.N. Farías, A. Fiorito, L.E. Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
topic_facet	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
description	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.
format	Artículo Artículo publishedVersion
author	Hermida, G.N. Farías, A. Fiorito, L.E.
author_facet	Hermida, G.N. Farías, A. Fiorito, L.E.
author_sort	Hermida, G.N.
title	Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
title_short	Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
title_full	Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
title_fullStr	Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
title_full_unstemmed	Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)
title_sort	ultrastructural characteristics of the lung of melanophryniscus stelzneri stelzneri (weyenberg, 1875) (anura, bufonidae)
publishDate	2002
url	http://hdl.handle.net/20.500.12110/paper_03279545_v26_n3_p347_Hermida
work_keys_str_mv	AT hermidagn ultrastructuralcharacteristicsofthelungofmelanophryniscusstelzneristelzneriweyenberg1875anurabufonidae AT fariasa ultrastructuralcharacteristicsofthelungofmelanophryniscusstelzneristelzneriweyenberg1875anurabufonidae AT fioritole ultrastructuralcharacteristicsofthelungofmelanophryniscusstelzneristelzneriweyenberg1875anurabufonidae
_version_	1769810392399216640

Ultrastructural characteristics of the lung of Melanophryniscus stelzneri stelzneri (Weyenberg, 1875) (Anura, Bufonidae)

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