The bulbus arteriosus of stenothermal and temperate teleosts: a morphological approach

ICARDO, J

doi:10.1006/jfbi.2000.1614

Cited by 3 publications

(6 citation statements)

References 8 publications

(9 reference statements)

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“…It could be possible that, as a phylogenetic difference, DAF-2DA-and MF-20-positive cells do not overlap in teleosts. The presence in the teleost bulbus of complete and partial (myofibroblast) smooth muscle cell phenotypes (Icardo et al, 2000b) would be compatible with the mixing of smooth muscle cells of cardiac neural crest and unknown (secondary heart field) (Waldo et al, 2005) origin shown at the base of the arterial trunks in transgenic mice (Jiang et al, 2000).…”

Section: Comparative Analysismentioning

confidence: 75%

“…It is a single, thick-walled segment whose main function is to act as an elastic reservoir or "windkessel": the bulbus dilates to receive the systolic volume and subsequently allows gradual liberation of the blood volume and protects the delicate gill vasculature. Despite the existence of a wide variety of structural organizations (Icardo et al, 1999a(Icardo et al, , 1999b(Icardo et al, , 2000a(Icardo et al, , 2000b, the bulbus seems to perform the same function in all species. Finally, three sets of cardiac valves are deployed at the sinoatrial, atrioventricular, and bulboventricular regions (for review, see Yamauchi, 1980;Santer, 1985;Satchell, 1991;Farrell and Jones, 1992;Burggren et al, 1997).…”

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confidence: 98%

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Conus arteriosus of the teleost heart: Dismissed, but not missed

Icardo

2006

Anat. Rec.

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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 conus supports the OFT valves, which should properly be named conus valves. Anat Rec Part A, 288A:900 -908, 2006.

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Section: Comparative Analysismentioning

confidence: 75%

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confidence: 98%

Conus arteriosus of the teleost heart: Dismissed, but not missed

Icardo

2006

Anat. Rec.

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“…Depending on the species, the ridges may be very prominent (Fig. 2.2a, b ) or much more discrete (Icardo et al 2000b ) . However, the real signi fi cance of these variations is currently unknown.…”

Section: The Out Fl Ow Tract: the Bulbus The Conus And The Conus Vamentioning

confidence: 99%

“…2.2b ). The ridge endocardium shows histological differences across species, ranging from squamous to columnar (Icardo et al 2000b ) . In addition, endocardial cells in many species contain moderately dense bodies (Benjamin et al 1984 ) of (mostly) unknown nature.…”

Section: The Out Fl Ow Tract: the Bulbus The Conus And The Conus Vamentioning

confidence: 99%

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The Teleost Heart: A Morphological Approach

Icardo

2012

Ontogeny and Phylogeny of the Vertebrate Heart

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Morphological analysis of the hagfish heart. I. The ventricle, the arterial connection and the ventral aorta

Icardo

Colvée

Schorno

et al. 2015

Journal of Morphology

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We have studied the heart in three species of hagfish: Myxine glutinosa, Eptatretus stoutii, and Eptatretus cirrhatus and report about the morphology of the ventricle, the arterial connection and the ventral aorta. On the whole, the hagfish heart lacks outflow tract components, the ventricle and atrium adopt a dorso-caudal rather than a ventro-dorsal relationship, and the sinus venosus opens into the left side of the atrium. This may indicate a "defective" cardiac looping during embryogenesis. The ventral aorta is elongated in M. glutinosa and E. stoutii but sac-like in E. cirrhatus. The ventricles are entirely trabeculated. The myocytes show a low myofibrillar content and junctional complexes formed by fascia adherens and desmosomes. Gap junctions could not be demonstrated. Myocardial cells in M. glutinosa contain numerous lipid droplets. These droplets are less numerous in E. stoutii and practically absent in E. cirrhatus, suggesting different metabolic requirements. Other cell types present in the ventricle are chromaffin cells and granular leukocytes that contain rod-shaped granules. The ventricle-aorta connection is guarded by a bicuspid valve with left and right, pocket-like leaflets. The leaflets extend from the cranial end of the ventricle into the aorta but the junction is asymmetrical. This junction contains a ganglion-like structure in E. cirrhatus. The ventral aorta shows endothelial, media, and adventitial layers. The media contains smooth muscle cells surrounded by dense bands formed by tightly-packed extracellular filaments. In addition, a short number of elastic fibers are observed in M. glutinosa and E. stoutii. Cellular and extracellular elements are more loosely organized in the aorta of E. cirrhatus. The collagenous adventitia contains ganglion-like cells in the three species. In the absence of nerves, chromaffin and ganglion-like cells may control the activity of the myocardium and that of the aortic smooth muscle cells, respectively.

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The bulbus arteriosus of stenothermal and temperate teleosts: a morphological approach

Cited by 3 publications

References 8 publications

Conus arteriosus of the teleost heart: Dismissed, but not missed

Conus arteriosus of the teleost heart: Dismissed, but not missed

The Teleost Heart: A Morphological Approach

Morphological analysis of the hagfish heart. I. The ventricle, the arterial connection and the ventral aorta

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