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The anatomical components of the cardiac outflow tract of the gray bichir, Polypterus senegalus: their evolutionary significance.
MedLine Citation:
PMID:  25169959     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
It has been reported that in chondrichthyans the cardiac outflow tract is composed of the myocardial conus arteriosus, while in most teleosteans it consists of the nonmyocardial bulbus arteriosus. Classical studies already indicated that a conus and a bulbus coexist in several ancient actinopterygian and teleost groups. Recent work has shown that a cardiac outflow tract consisting of a conus and a bulbus is common to both cartilaginous and bony fishes. Nonetheless and despite their position at the base of the actinopterygian phylogenetic lineage, the anatomical arrangement of the cardiac outflow tract of the Polypteriformes remained uncertain. The present study of hearts from gray bichirs was intended to fill this gap. The cardiac outflow tract of the bichir consists of two main components, namely a very long conus arteriosus, furnished with valves, and a short, intrapericardial, arterial-like bulbus arteriosus, which differs from the ventral aorta because it is covered by epicardium, shows a slightly different spatial arrangement of the histological elements and is crossed by coronary arteries. Histomorphologically, the outflow tract consists of three longitudinal regions, distal, middle and proximal, an arrangement which has been suggested to be common to all vertebrates. The distal region corresponds to the bulbus, while the conus comprises the middle and proximal regions. The present findings reinforce the notion that the bulbus arteriosus of fish has played an essential role in vertebrate heart evolution as it is the precursor of the intrapericardial trunks of the aorta and pulmonary artery of birds and mammals.
Authors:
Ana C Durán; Ismael Reyes-Moya; Borja Fernández; Cristina Rodríguez; Valentín Sans-Coma; Adrian C Grimes
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-8-12
Journal Detail:
Title:  Zoology (Jena, Germany)     Volume:  -     ISSN:  1873-2720     ISO Abbreviation:  Zoology (Jena)     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-8-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9435608     Medline TA:  Zoology (Jena)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014. Published by Elsevier GmbH.
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