Abstract
The embryonic development of the cell population of the mammalian vitreous has been traced to two sources: the undifferentiated mesenchymal cells of the eye primordium and the primitive reticular cells of the bone marrow. Undifferentiated mesenchymal cells invade the future vitreous space in two ways: through the annular opening between the rim of the optic cup and the lens primordium, and through the open embryonic fissure. They differentiate into prevascular cells, hemangioblasts, and fibrocytes located in the area of the optic nerve head. From the very beginning of fetal development, another ameboid-type cell of mesenchymal origin makes its entrance into the vitreous through the hyaloid vessels; these monocyte-like cells differentiate into hyalocytes and populate a well-defined area of the cortical vitreous close to the retina and to the ora serrata. Gamma-irradiation (600 rads) of newly born rabbits and cats decreases the number of migrating amebocytes in their vitreous; 24 h later, however, they are replaced by monocytes from the hyaloid vessels.
Zusammenfassung
In der Embryonalentwicklung der im Corpus vitreosus von Säugern nachweisbaren Zellpopulation lassen sich 2 Ursprünge dieser Glaskörperzellen nachweisen: die undifferenzierten Mesenchymzellen der Augenanlage und die primitiven Reticulumzellen des Knochenmarks.
Undifferenzierte Mesenchymzellen gelangen entweder durch die kreisförmige Öffnung zwischen dem Rand des Augenbechers und der Linsenanlage oder durch den offenen Augenbecherspalt in den späteren Glaskörperraum. In der Umgebung des Sehnerveneintritts differenzieren sie sich in angiogenetische Zellen, Haemangioblasten und Fibrocyten. Eine weitere amöboide Zellart gelangt in den Frühstadien der Fetalentwicklungen durch die Vasa hyaloidea in den Glaskörper. Diese monocytenartigen Zellen entwickeln sich zu Hyalocyten und besiedeln einen abgrenzten Bereich der Glaskörperrinde in unmittelbarer Nachbarschaft zur Retina und zur Ora serrata. Gamma-Bestrahlung (600 rad) neugeborener Kaninchen und Katzen verringert die Anzahl dieser Glaskörperrindenzellen; 24 Stunden später sind sie jedoch durch aus den Vasa hyaloidea eingewanderte Monocyten ersetzt.
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This investigation was supported by National Institutes of Health Research Grants No. EY 001747 and EY 00184 from the National Eye Institute
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Balazs, E.A., Toth, L.Z. & Ozanics, V. Cytological studies on the developing vitreous as related to the hyaloid vessel system. Albrecht von Graefes Arch. Klin. Ophthalmol. 213, 71–85 (1980). https://doi.org/10.1007/BF00413534
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DOI: https://doi.org/10.1007/BF00413534