Globuli ossei in the Long Limb Bones of Pleurodeles waltl (Amphibia, Urodela, Salamandridae) - Université Pierre et Marie Curie Access content directly
Journal Articles Journal of Morphology Year : 2014

Globuli ossei in the Long Limb Bones of Pleurodeles waltl (Amphibia, Urodela, Salamandridae)

Abstract

To date, little is known about the structure of the cells and the fibrillar matrix of the globuli ossei, globular structures showing histochemical properties of an osseous tissue, sometimes found in the resorption front of the hypertrophied cartilage in many tetrapods, and easily observed in the long bones of the Urodele Pleurodeles waltl. Here, we present the results obtained from the appendicular long bones of metamorphosed juveniles and subadults using histological and histochemical methods and transmission electron microscopy. The distal part of the cone-shaped cartilage contains a heterogeneous cell population composed of the typical “light” hypertrophic chondrocytes and scarce “dark” hypertrophic chondrocytes. The “dark” chondrocytes display ultrastructural character- istics suggesting that they probably undergo degeneration through chondroptosis. However, in the hypertrophic, cal- cified cartilage close to the erosion front by the marrow, several noninvaded chondrocytic lacunae retained cells that do not show any morphological characteristics of degeneration and that cannot be identified as regular chondrocytes or osteocytes. These modified chondrocytes that have lost their regular morphology, appear to be active in the terminal cartilage and synthesize collagen fibrils of a peculiar diameter intermediate between the Type I collagen found in bone and the Type II collagen characteristic of cartilage. It is suggested that the local occurrence of globuli ossei is linked to a low rate of longitu- dinal growth as is the case in the long bones of postmeta- morphic urodeles.

Domains

Earth Sciences

Dates and versions

hal-01402225 , version 1 (24-11-2016)

Identifiers

Cite

Alexandra Quilhac, Armand de Ricqlès, Hayat Lamrous, Louise Zylberberg. Globuli ossei in the Long Limb Bones of Pleurodeles waltl (Amphibia, Urodela, Salamandridae). Journal of Morphology, 2014, 275 (11), pp.1226-1237. ⟨10.1002/jmor.20296⟩. ⟨hal-01402225⟩
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