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Biomedical subjects

N Diaconescu

Publications and source records attributed to N Diaconescu.

13 recordsLinked to original sources
PubMed1975

Contribution to the clinical anatomy of the vertebral column. Considerations on the stability and the instability at the height of the "vertebral units".

Based on the findings with human cadaver material and the literature data, the concept of "vertebral unit" is discussed as a basic morphofunctional and pathogenic unit of the vertebral column. The vertebral structures collaborating to the stabilization of the vertebral units are described and a review is made of the possibilities of installation of a vertebral instability. An attempt is made to define the vertebral stability and instability.

Biomechanical Phenomena↗
PubMedDate not supplied

Some peculiarities of osteomedullary interrelations at the level of the lateral wall of the maxillary sinus.

Several structural aspects in the lateral wall of the maxillary sinus are shown, revealing the existence of some peculiarities of the osteomedullary relationships at this level, as for instance: a) a great density of vascular canals, b) a marked collagen density and a high degree of polymerization of the ground substance pleading for a great stability of the osseous structure, and c) a relative cellular scarcity inside the marrow-like spaces as an expression of a reduced reactive ability of bone marrow. It is considered that these peculiarities are not merely determined by specific functional needs of the bone as a tissue, but mainly by subordination of the latter to the requirements of the higher-ordered structural and functional levels served by a certain osseous zone.

Animals↗
PubMedDate not supplied

Biomechanical interpretations of some bony structures in the skull.

For the causal understanding of some evolutive morphological particularities at the level of the lateral wall of orbits (in mammals and in man), the authors have resorted to biomechanical interpretations of bony structures at the cranium level. To this effect some stress factors as well as the modeling effect on the local bone morphogenesis have been analysed.

Animals↗
PubMedDate not supplied

Contributions to the evolutionary study of the liver afferent veins.

The extra- and intrahepatic venous afferent devices have been followed up in their evolution in all the classes of vertebrates and in man. There were studied 319 cases in 19 vertebrate species, in situ by the method of corrosion preparates with acid-resistant plastic materials or radiographies. The extraparenchymal afferent venous device shows an evolution characterized by the maintenance and improvement of the visceral hepatic venous system and by the gradual freeing of somatic parietal afferences, substantiating new anatomical notions like "liver visceralization", "hepatic parietal territories" and allowed the ascertainment of an evolutionary phyletic line of the liver based on the progressive diminution of the hepatic parietal territory. The basic characteristic type of intrahepatic distribution of the portal vein was sketched beginning with the testudine reptiles and was maintained including man. The liver segmentary angioarchitecture appeared already in birds. These findings allowed the homologation of the cleaved liver with the unitary liver of mammals and man as well as the homologation of the hepatic organ of mammals, birds and of some reptiles, and the understanding of the emergence variation of the portal vein ventrocranialis dexter.

Animals↗