Individual variability in the structure of the walls of the principal trunks of the subcutaneous veins of the lower extremities of the human fetus
Boka, S.A.
Arkhiv Anatomii Gistologii i Embriologii 88(6): 44-48
1985
ISSN/ISBN: 0004-1947 PMID: 4051766 Document Number: 261574
Certain regional peculiarities are noted in the development process of the human principle trunks of the subcutaneous veins during antenatal period. In the fetuses of all ages the wall thickness of the subcutaneous veins is the greatest in the femur, and the middle tunic is better developed in the shin. The vein structure depends on the type of architectonics: at the magistral type (86%) the walls in the large and minor subcutaneous veins are thick with well developed smooth myocytes and connective tissue fibers; at the reticulate type (14%) the walls are thin, their elements are poorly developed. When there is mentioned varicosity of the lower extremity veins in the parents' anamnesis, in fetuses (57%) all the tunics in the venous wall develop more poorly, there is retardation in formation of smooth myocytes and in maturation of collagen fibers. This results in less amount of contractile structures in the middle tunic and optic density of collagen is less manifected.