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The author examined histologically and histochemically the peculiarities of tendon tissue of human embryos and fetuses. Inferences were made that under the conditions of organ culture for 7 days in the explanted tendon pieces there were histological peculiarities, characteristic of the reactions of the embryonal tendon tissue in the preparation and of the ossification with formation of "a zone of cellular columns". Processes of ossification were not observed which is explained by the lack of vascular in the explants. He found a reduced amount of acid glycosaminoglycans, an increase of the amount of neutral mucopolysaccharides and topographic redistribution of lipids and glycogen contrary to the data, observed in the control tissues.

The authors examined some age and topographic peculiarities in the occurrence and microscopic characteristics of glucosamineglycanes, glycogen, lipids, calcium compounds and collagenous fibres during the course of the embryonal development of man. The deposition of glycogen and lipids in chondroblasts after the third-fourth week of embryonal development was indicated as well as the appearance of glucosamineglycanes in the intercellular substance during the same period. The role of the same substances in the differentiation of the cartilaginous tissue was stressed. The authors pointed out the well manifested PAS-reactivity of the superficial layer of the periosteum as a typical peculiarity of this formation.