2026-05-30T23:14:20Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/56592026-02-03T12:21:46Zcom_10630_2254col_10630_37959
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Sans-Coma, Valentín
author
Reyes-Moya, Ismael
author
Fernández-Corujo, Borja
author
Soto, M. Teresa
author
Durán-Boyero, Ana Carmen
2013-07-26T08:07:24Z
2013-07-26T08:07:24Z
2013-07-26
http://hdl.handle.net/10630/5659
In chondrichthyans and actinopterygians, the outflow tract of the heart, namely, the
cardiac portion intercalated between the ventricle and the ventral aorta, consists of two
anatomical components: conus arteriosus and bulbus arteriosus. In chondrichthyans and
extant representatives of phylogenetically ancient actinopterygian groups, the conus and
bulbus are well-developed in size, whereas in most teleosts, the bulbus is markedly
larger than the conus. Current knowledge about the cardiac outflow tract of the
polypteriformes is scarce and highly contradictory, a fact that contrasts with their
crucial phylogenetic position at the source of the actinopterygian lineage. In fact, it
remains uncertain whether they have a bulbus at the arterial pole of the heart. The
present study aimed to elucidate the anatomical arrangement of the cardiac outflow tract
of the bichir in an attempt to improve our understanding of the evolution of the
vertebrate heart. We examined the hearts from 12 bichirs using histochemical and
immunohistochemical techniques. Our findings showed that the outflow tract of the
bichir consists of two components, namely, a long conus arteriosus, largely composed
of myocardial tissue and furnished with a variable number of valves at its luminal side,
and a very short, elastin rich bulbus arteriosus, devoid of myocardium. The bulbus has
an arterial-like histological composition. However, it differs from the aorta because it
has a thicker wall, shows a different arrangement of the histological elements, is
covered by the epicardium and is crossed by coronary arteries. The present observations
are consistent with the notion that the conus arteriosus and the bulbus arteriosus have
coexisted from the beginning of the jawed vertebrate radiation. This is of particular
interest, because there is evidence that the bulbus arteriosus, which is a second heart
field derivative, is homologous with the intrapericardial portions of the aorta and
pulmonary artery of birds and mammals.
eng
Polypteriformes - Anatomía
The anatomical components of the cardiac outflow tract of the bichir, polypterus senegalus. Evolutionary significance
conference output
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4. Summary ICVM10 COFT of the bichir 05.02.13.pdf
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4. Summary ICVM10 COFT of the bichir 05.02.13.pdf.txt