Morfologia do coração da lagartixa Hemidactylus mabouia (Moreau Jonnès, 1818) (Squamata: Gekkonidae)

• Autor(a) principal: Rezende, Rafael Marins
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2335
• topic: Anatomia; Histologia; Ultra-estrutura; Coração; Lagartixa; Anatomy; Histology; Ultrastructure; Heart; Gecko; CNPQ::CIENCIAS BIOLOGICAS::BIOLOGIA GERAL

The lizard of the species Hemidactylus mabouia (Gekkonidae) is an efficient colonizer, well established in Brazil and typically found in urban areas areas. It is a nocturnal species that can be found near light sources, is easy to capture and use in experimental models with reptiles. Thus, in order to describe the morphology of the H. mabouia heart, and looking characters that can contribute to comparative studies of reptiles, 11 adult specimens were used which were collected fragments of the heart that were processed according to routine methods for analyzing anatomical, histological, histochemical and ultrastructural. The heart of the gecko H. mabouia, like most non-crocodilian reptiles, has the sinus venosus, two atria and one ventricle, incompletely separated, occurring partial misture between arterial and venous blood. The sinus venosus is a thin-walled tubular chamber, comprising the heart muscle and connective tissue that receives the left precava, right precavaand postcava vein. The atria have a tetrahedral irregular shape, their walls are thin and formed by spongy myocardium. The left atrium is smaller and less muscular than the right atrium. The left atrium receives blood from the pulmonary vein, which opens in its dorsal wall. The ventricle has a compact myocardium surrounding the spongy myocardium. The connective tissue is sparse in the ventricle, and the muscle fibers are oriented indifferent directions. The interior of the ventricle chamber is divided into three interconnected subchambers: cavum pulmonale, cavum venosum and cavum arteriosum. The three subchambers intercommunicate, but have two important, incomplete muscle septa: the vertical septum and the ventricular septum. The nuclei observed appear ovoid and elongated. We also observed the presence of both cartilage cell, in support of the cartilaginous septum aorticopulmonar, and bone cell, located in the bony structure located at anterior end of the muscular ridge. Both atria and ventricles are covered externally by the epicardium and internally by the endocardium. Muscle fibers show striation, but the arrangement of the myofibrils does not appear tp be more uniform within the same fiber. It was not possible to see clear pictures of intercalated disks.