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Retinal histogenesis and cell differentiation in an elasmobranch species, the small‐spotted catshark Scyliorhinus canicula
TLDR
It is found that the retina of the small‐spotted catshark was fully differentiated prior to birth, and retinal cell differentiation followed a vitreal‐to‐scleral gradient, with the exception of Müller cells that were the last cell type generated during retinogenesis.
Structure and vascularization of the ventricular myocardium in Holocephali: their evolutionary significance
TLDR
The present findings show for the first time that in a wild living vertebrate species, specifically H. affinis, an extensive coronary artery system supplying the whole cardiac ventricle exists in the absence of a well‐developed compact ventricular myocardium, consistent with the notion derived from experimental work that myocardial cell proliferation and coronary vascular growth rely on distinct developmental programs.
The anatomical components of the cardiac outflow tract of the gray bichir, Polypterus senegalus: their evolutionary significance.
TLDR
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.
Chondrichthyans have a bulbus arteriosus at the arterial pole of the heart: morphological and evolutionary implications
TLDR
These findings, together with other observations in holocephals and several elasmobranch species, confirm that chondrichthyans possess a bulbus arteriosus interposed between the conus arteriosu and the ventral aorta, and indicate that the primitive heart of gnathostomates consists of five intrapericardial components, sinus venosus, atrium, ventricle, conusarteriosus and bulbus arteries.
Embryonic development of the bulbus arteriosus of the primitive heart of jawed vertebrates
TLDR
The embryological findings in a elasmobranch species are consistent with the notion that a second heart field has existed since the beginning of the jawed vertebrate radiation and that the bulbus arteriosus of chondrichthyans is a secondheart field-derived structure.
Intimal thickening of coronary arteries in the rabbitfish, Chimaera monstrosa L. (Chondrichthyes: Holocephali).
TLDR
It is concluded that (1) these changes are age-related in the rabbitfish and (2) local intense mechanical tension seems to be an important factor in their formation in this species.
The anatomical components of the cardiac outflow tract of chondrichthyans and actinopterygians
TLDR
It is suggested herein that the primitive anatomical heart of the jawed vertebrates consisted of a sinus venosus containing the pacemaker tissue, an atrium possessing trabeculated myocardium, and a non‐myocardial bulbus arteriosus that connected the conus with the ventral aorta.
Rudimentary Coronary Artery in Syrian Hamsters (Mesocricetus auratus)
TLDR
It is suggested that an unusual prolonged time interval in the development of the embryonic coronary stems might be a key factor in the formation of coronary arteries displaying significantly dissimilar developmental degrees.
The relative length of the cardiac bulbus arteriosus reflects phylogenetic relationships among elasmobranchs
TLDR
The findings confirmed that the bulbus arteriosus is indeed a cardiac outflow tract component commonly present in all elasmobranchs examined, and suggested that both anatomical traits are associated with the phylogenetic position of the sharks and rays investigated.
Dicephalous v. diprosopus sharks: record of a two-headed embryo of Galeus atlanticus and review of the literature.
TLDR
The first description of a two-headed shark embryo belonging to an oviparous species, Galeus atlanticus (Carcharhiniformes: Scyliorhinidae), detected among 797 embryos intended for cardiovascular studies, represents a defect incidence of 0·13%.
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