In D. listerianum mature eggs are isoltaed in the tunic where embryos develops. The process of egg segregation was studied by light and electron microscopy. Initially the egg is contained in a sac-like pocket of the epidermis which narrows to form an ephemeral collar at its proximal end. The follicle cells discharged from the egg are retracted towards the zooid to block the aperture of the collar. The epidermis breaks close to the egg and the lips of the wound heal rapidly, enclosing the egg in the tunic and later re-establishing the epidermal continuity of the zooid. Both granulocytes form the bloodstream and epitheliocytes engulf tissue debris. Moreover, apocrine secretion of the epidermis participates in tunic restoration. The permeability barrier of the zooid seems to be assured by tight junctions, together with the plug of follicle cells.

Tissue repair during egg segregation in tunic of the compound ascidian, Diplosoma listerianum

ZANIOLO, GIOVANNA
1987

Abstract

In D. listerianum mature eggs are isoltaed in the tunic where embryos develops. The process of egg segregation was studied by light and electron microscopy. Initially the egg is contained in a sac-like pocket of the epidermis which narrows to form an ephemeral collar at its proximal end. The follicle cells discharged from the egg are retracted towards the zooid to block the aperture of the collar. The epidermis breaks close to the egg and the lips of the wound heal rapidly, enclosing the egg in the tunic and later re-establishing the epidermal continuity of the zooid. Both granulocytes form the bloodstream and epitheliocytes engulf tissue debris. Moreover, apocrine secretion of the epidermis participates in tunic restoration. The permeability barrier of the zooid seems to be assured by tight junctions, together with the plug of follicle cells.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2506120
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