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Biomedical subjects

A Dhem

Publications and source records attributed to A Dhem.

82 records · Page 5Linked to original sources
PubMedDate not supplied

Hypermineralized lamellae below the bone surface: a quantitative microradiographic study.

Hypermineralized lamellae similar to interstitial resting lines were identified by microradiography beneath haversian, endocortical, and trabecular resting surfaces in 42 subjects aged 18-96 years. In cross-sectioned osteons, this hypermineralized lamella appeared as a circle showing the same high microdensity as the inner margin of the haversian canal. Bone tissue separating this circle and the margin was more mineralized than the peripheral lamellae of the osteon. In the tibia, 13.7 +/- 0.9% (Mean +/- SE) of Haversian canals exhibited a hypermineralized circle, localized at a distance of 20 +/- 0.4 microns from the canal wall. The scalloped haversian canals, different from osteoclastic resorption cavities, represented 9.9 +/- 0.7% of the haversian canals. There was a significant correlation between both types of haversian canals. Therefore, hypermineralized lamellae can appear at the end of bone apposition, whatever the bone surface. Their high mineral content may secondarily lead to an increased brittleness of the most superficial lamellae and even to their disaggregation.

Adolescent↗
PubMedDate not supplied

[Left caudal vena cava: report of a case].

The infrarenal part of the vena cava inferior running at the left side of the abdominal aorta has been observed in a 70 years old caucasian man without any other anomaly in the position of the abdominal viscera. This atypical vascular pattern was associated with the persistence of a rudimentary right inferior vena cava corresponding to the right supracardinal vein. The embryonic origin of this anatomical variation and its clinical importance are discussed.

Aged↗
PubMedDate not supplied

Skeletal growth and chondroid tissue.

Membranous and endochondral ossification processes are insufficient to describe all the aspects observed in the growing skeleton. The presence of chondroid tissue that we have identified by means of all modern histological techniques, including those able to detect the different types of collagen, has also to be explained. Present in the mandibular symphysis of either the human or cat fetuses, chondroid tissue has also been observed in the other parts of the mandible, in the sutural areas of the skull and in all the bones of both axial and appendicular skeleton. The differentiation of the mesenchyme into chondroid tissue could probably be related with mechanical forces exerted simultaneously in opposite directions or with a transient ischemia.

Animals↗