Formation of cartilage in aortic valves of Syrian hamsters

Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
D LópezV Sans-Coma


The formation of cartilage in aortic valves of Syrian hamsters was studied using histological, histochemical and immunohistochemical techniques. The sample consisted of 281 specimens aged 0-363 days, all of which had a normal (tricuspid) aortic valve. The first sign of valvular chondrogenesis is the presence of small groups of cells embedded in a type II collagen-positive matrix. These groups of cells, which can appear as early as one day after birth, increase in size and differentiate into hyaline cartilage or fibrocartilage. From the fourth day of life, all hamsters examined displayed cartilaginous foci in the aortic valve. They were located along the fibrous attachments of the valve leaflets to their respective sinuses, including the valve commissures. A considerable proportion (76%) of cartilages formed within the first 40 days of life, that is during the period of time in which the histogenesis of the valve takes place. The present observations are consistent with the assumption that in mammals, the precursors of the aortic valve chondrocytes are neural crest-derived cells. Results of a statistical analysis substantiate that the incidence is significantly higher in (1) the territory that comprises the collagenous condensat...Continue Reading


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Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
D LópezV Sans-Coma
Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
D LópezV Sans-Coma
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