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dc.contributor.authorDurán, Ana C.
dc.contributor.authorLópez-Unzu, Miguel A.
dc.contributor.authorRodríguez, Cristina
dc.contributor.authorLorenzale, Miguel
dc.contributor.authorFernández, Borja
dc.contributor.authorSans-Coma, Valentin 
dc.date.accessioned2013-07-25T11:27:17Z
dc.date.available2013-07-25T11:27:17Z
dc.date.issued2013-07-25
dc.identifier.urihttp://hdl.handle.net/10630/5656
dc.descriptionEl resumen aparece en el Program & Abstracts of the 10th International Congress of Vertebrate Morphology, Barcelona 2013. Anatomical Record, Volume 296, Special Feature — 1: P-075.es_ES
dc.description.abstractIt has been classically assumed that the ventricle of the primitive vertebrate heart is composed of spongy myocardium, supplied exclusively by oxygen-poor, luminal blood. This idea is on two facts: (1) extant agnathans have a spongy ventricular myocardium, and (2) in avian and mammalian embryos, the formation of trabeculated myocardium precedes the appearance of compact myocardium. Recently, it has been proposed that, like elasmobranchs, the early gnathostomes possess a fully vascularised ventricle composed of mixed myocardium. We tested this idea by studying the structure and vascularisation of the ventricular myocardium in four holocephalan species of the families Chimaeridae and Rhinochimaeridae. Chimaera monstrosa, Hidrolagus affinis and Harriotta raleighana have a spongy myocardium covered by a thin layer of cardiac muscle. In H. raleighana, the compacta is reduced to an extremely fine rim. In all three species there is a well-developed coronary artery system consisting of subepicardial vessels which give off branches that penetrate the myocardial trabeculae. Rhinochimaera atlantica has no compacta and its ventricular coronary artery system is reduced to subepicardial vessels that do not enter the spongy layer. This report is the first to show that in wild living vertebrates, a coronary artery system supplying the whole myocardium exists in the absence of a well-developed compacta, which supports experimental work that shows that myocardial cell proliferation and coronary vascular growth rely on genetically separated programs. We conclude that the mixed ventricular myocardium is primitive for chondrichthyans, and that the lack of compacta in some holocephalans is a derived character. Moreover our results support the hypotheses that the mixed myocardium is the primitive condition in gnathostomes, and that the absence of a compacta in different actinopterygian taxa is the result of its repeated loss during evolution.es_ES
dc.description.sponsorshipProyecto CGL2010-16417/BOS; Fondos FEDERes_ES
dc.language.isoenges_ES
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectQuimeriformes - Anatomíaes_ES
dc.subject.otherHeartes_ES
dc.subject.otherHolocephalies_ES
dc.subject.otherVentriclees_ES
dc.subject.otherMyocardiumes_ES
dc.subject.otherCoronary arterieses_ES
dc.titleMYOCARDIAL STRUCTURE AND VASCULARIZATION OF THE HEART VENTRICLE IN HOLOCEPHALI: IMPLICATIONS FOR HEART EVOLUTIONes_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroFacultad de Cienciases_ES


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