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Abstract: The morphological characteristics of the venous pole and pericardium of the heart were examined in three hagfish species, Myxine glutinosa, Eptatretus stoutii, and Eptatretus cirrhatus. In these species, the atrioventricular (AV) canal is long, funnel-shaped and contains small amounts of myocardium. The AV valve is formed by two pocket-like leaflets that lack a papillary system. The atrial wall is formed by interconnected muscle trabeculae and a well-defined collagenous system. The sinus venosus (SV) shows a collagenous wall and is connected to the left side of the atrium. An abrupt collagen-muscle boundary marks the SV-atrium transition. It is hypothesized that the SV is not homologous to that of other vertebrates which could have important implications for understanding heart evolution. In M. glutinosa and E. stoutii, the pericardium is a closed bag that hangs from the tissues dorsal to the heart and encloses both the heart and the ventral aorta. In contrast, the pericardium is continuous with the loose periaortic tissue in E. cirrhatus. In all three species, the pericardium ends at the level of the SV excluding most of the atrium from the pericardial cavity. In M. glutinosa and E. stoutii, connective bridges extend between the base of the aorta and the ventricular wall. In E. cirrhatus, the connections between the periaortic tissue and the ventricle may carry blood vessels that reach the ventricular base. A further difference specific to E. cirrhatus is that the adipose tissue associated with the pericardium contains thyroid follicles.
Fuente: Journal of Morphology, 2016, 277(7), 853-865
Editorial: Wiley-Blackwell
Fecha de publicación: 01/07/2016
Nº de páginas: 13
Tipo de publicación: Artículo de Revista
DOI: https://doi.org/10.1002/jmor.20539
ISSN: 0362-2525,1097-4687
Url de la publicación: https://doi.org/10.1002/jmor.20539
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JOSE MANUEL ICARDO DE LA ESCALERA
ELVIRA COLVEE BENLLOCH
SCHORNO, SARAH
LAURIANO, EUGENIA R.
FUDGE, DOUGLAS S.
GLOVER, CHRIS N.
ZACCONE, GIACOMO
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