The regeneration of the pineal body cornea in river lampreys Lampetra fluviatilis

Lebkova, N.P.

Nauchn Dokl Vysshei Shkoly Biol Nauki 1: 60-63


Accession: 025908942

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The corium and epidermis of the pineal cornea were removed in 50 river lampreys. Results were obtained in only 10 specimens, which were killed 30, 37, and 165 days after the operation. At 30 and 37 days after the operation, the wound was completely covered with a typical epidermis, with a larger coagulum of fibrin beneath it. After 165 days, substantial changes took place in the regenerated tissue. During this time, restoration of the corium at the edges of the regenerative tissue started from the old corium, and that of the central parts from the porous connective tissue underneath and the compact connective tissue of the meninges. The gland cells, which appeared in increased numbers 30-37 days after the operation, had disappeared by this time in the regenerated epidermis. After 165 days, the epidermis consisted of homogeneous differently-shaped small cells connected to each other by intercellular bridges, and of a lower layer of narrow, vertically-oriented basal cells. The epithelium of the regenerated pineal cornea was very similar to the corneal epithelium of the lateral eyes of the lamprey. According to the author's view, the transformation of the epidermis of the pineal cornea, during its regeneration, into the corneal epithelium is an example of atavistic regeneration and indicates the origin of the photoreceptive function of pineal organs.