Hiérarchie anatomique

Anatomie générale > Organes des sens > Oeil et structures apparentées > Bulbe oculaire > Cristallin > Fibres du cristallin

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Description

The lens fibers form the bulk of the lens. They are long, thin, transparent cells, firmly packed, with diameters typically between 4-7 micrometres and lengths of up to 12 mm long.The lens fibers stretch lengthwise from the posterior to the anterior poles and, when cut horizontally, are arranged in concentric layers rather like the layers of an onion. If cut along the equator, it appears as a honeycomb. The middle of each fiber lies on the equator.These tightly packed layers of lens fibers are referred to as laminae. The lens fibers are linked together via gap junctions and interdigitations of the cells that resemble "ball and socket" forms.

The lens is split into regions depending on the age of the lens fibers of a particular layer. Moving outwards from the central, oldest layer, the lens is split into an embryonic nucleus, the fetal nucleus, the adult nucleus, and the outer cortex. New lens fibers, generated from the lens epithelium, are added to the outer cortex. Mature lens fibers have no organelles or nuclei.


Cette définition inclut du texte du site wikipedia - Wikipedia: l'encyclopédie libre . (le 22 Juillet 2004) . FL : Wikimedia Foundation , Inc. Récupéré le 10 Août 2004, à partir http://www.wikipedia.org

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