[The hexosamines of the umbilical cord vessel walls].

Qualitative and quantitative compositions of hexosamines in arteries and veins of umbilical cord have been determined. The qualitative compositions of hexosamines in umbilical cord vessels are identical, namely they are composed of glucosoamine and galactosoamine. It has been shown that hexosamines occurred mainly as glycosoaminoglycans (GAG). Qualitative and quantitative compositions of GAG have been determined. It has been revealed that qualitative compositions of GAG of umbilical cord vessels are identical and they have been presented as follows: hyaluronic acid, heparane sulphate, chondroitine-6-sulphate, dermatane sulphate. Concerning the GAG, the difference between veins and arteries consist in higher content of hyaluronic acid and lower content of chondroitine-6-sulphate. The high content of hyaluronic acid in vein walls is probably connected with their permability.