Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/16727
Título: Heart structure in the Amazonian teleost Arapaima gigas (Osteoglossiformes, Arapaimidae)
Autor: Buzete Gardinal, Mario Vitor
Rocha Ruiz, Thalles Fernando
Estevan Moron, Sandro
Yoshioka, E. T.O.
Gonçalves, Ligia Uribe
Franceschini-Vicentini, Irene Bastos
Vicentini, Carlos Alberto
Palavras-chave: Anatomical Concepts
Animals Experiment
Animals Tissue
Arapaima Gigas
Cardiac Muscle
Controlled Study
Coronary Blood Vessel
Developmental Stage
Heart
Heart Ventricle
Histology
Nonhuman
Priority Journal
Microscopy, Electron, Scanning
Stereomicroscopy
Structure Analysis
Ultrastructure
Vascularization
Data do documento: 2019
Revista: Journal of Anatomy
É parte de: Volume 234, Número 3, Pags. 327-337
Abstract: The fish heart ventricle has varied morphology and may have a specific morpho-functional design in species adapted to extreme environmental conditions. In general, the Amazonian ichthyofauna undergoes constant variations in water temperature, pH and oxygen saturation, which makes these species useful for investigations of cardiac morphology. Arapaima gigas, a member of the ancient teleost group Osteoglossomorpha, is one of the largest freshwater fish in the world. This species has a specific heart metabolism that uses fat as the main fuel when O 2 supplies are abundant but also can change to glycogen fermentation when O 2 content is limiting. However, no information is available regarding its heart morphology. Here, we describe the heart of A. gigas, with emphasis on the ventricular anatomy and myoarchitecture. Specimens of A. gigas weighing between 0.3 and 4040 g were grouped into three developmental stages. The hearts were collected and the anatomy analyzed with a stereomicroscope, ultrastructure with a scanning electron microscope, and histology using toluidine blue, Masson's trichrome and Sirius red stains. The ventricle undergoes morphological changes throughout its development, from the initial saccular shape with a fully trabeculated myocardium and coronary vessel restricted to the subepicardium (Type I) (group 1) to a pyramidal shape with mixed myocardium and coronary vessels that penetrate only to the level of the compact layer (Type II) (groups 2 and 3). The trabeculated myocardium has a distinct net-like organization in all the specimens, differing from that described for other teleosts. This arrangement delimits lacunae with a similar shape and distribution, which seems to allow a more uniform blood distribution through this myocardial layer. © 2018 Anatomical Society
DOI: 10.1111/joa.12919
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