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Conus arteriosus of the teleost heart: Dismissed, but not missed
Abstract
The heart outflow tract (OFT) of primitive fish is formed by two portions: a proximal conus arteriosus and a distal bulbus arteriosus. The OFT of modern teleosts is considered to be formed by a single component, the bulbus, the conus having been lost through evolution. This article challenges the concept of the disappearance of the conus arteriosus in the teleost heart. A total of 28 teleost species belonging to 19 families and 10 orders were analyzed. The hearts were divided into two large groups: those having entirely trabeculated ventricles, and those possessing a compacta. In the hearts having entirely trabeculated ventricles, the conus arteriosus appears as a distinct segment interposed between the ventricle and the bulbus arteriosus, being formed by compact vascularized myocardium. However, the conus of several species lacks vessels. In these cases, the conus presents large intercellular spaces bounded by collagen. In the hearts possessing a ventricular compacta, the conus either appears as a muscular ring of variable length connecting the ventricle and the bulbus or forms a crown or ring of myocardium apposed to the ventricular base. In all the teleosts studied, the conus can be recognized as an anatomic entity different from the ventricle. Furthermore, the conus appears as a distinct heart segment in the developing fish. Therefore, the conus arteriosus has not been lost in evolution and constitutes a fundamental part of the teleost OFT. In all the species studied, the…
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According to comparative anatomical analyses, the conus arteriosus was present in early jawed vertebrates but has been lost in most teleost species.
“According to comparative anatomical analyses, this structure was present in early jawed vertebrates but has been lost in most teleost species (Icardo, 2006).”
From Ancestral developmental potentials in early bony fish contributed to vertebrate water-to-land transition (2021) · cites this paper as Icardo, 2006
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Metadata
- Authors
- Icardo, J. M.
- Venue
- The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology
- Publisher
- Wiley
- Published
- 2006-07-11
- Volume
- 288A
- Issue
- 8
- Pages
- 900-908
- ISSN
- 1552-4884 (ISSN-L)
- 1552-4892
- OpenAlex
- W2054547150
- Cited by
- 50
- References
- 34
- Citations by year
- 2026: 1 · 2024: 4 · 2023: 4 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 4 · 2014: 2 · 2013: 2 · 2012: 6
- FWCI
- 1.73
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Anatomical Record Part A Discoveries in Molecular Cellular and Evolutionary Biology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Anatomy › Comparative Animal Anatomy Studies
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Keywords
- conus arteriosus, teleost heart, bulbus arteriosus, heart evolution, heart development
- MeSH terms
- Animals, Fishes, Heart, Heart Valves, Heart Ventricles, Terminology as Topic, Species Specificity
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