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It is composed of strong, randomly oriented collagen fibrils in which the smooth anterior surface faces the epithelial basement membrane and the posterior surface merges with the collagen lamellae of the corneal stroma proper. [1] In adult humans, Bowman's layer is 8-12 μm thick. [2] With ageing, this layer becomes thinner.
The cornea is a transparent structure that is part of the outer layer of the eye. It refracts light and protects the contents of the eye. The cornea is about one-half to one millimeter thick in the dog and cat. [1] The trigeminal nerve supplies the cornea via the long ciliary nerves.
Lamellae, the fibers of which are cut across, producing a dotted appearance; Corneal corpuscles appearing fusiform in section; Lamellae, the fibers of which are cut longitudinally; Transition to the sclera, with more distinct fibrillation, and surmounted by a thicker epithelium; Small blood vessels cut across near the margin of the cornea
Lamellae, the fibers of which are cut across, producing a dotted appearance; Corneal corpuscles appearing fusiform in section; Lamellae, the fibers of which are cut longitudinally; Transition to the sclera, with more distinct fibrillation, and surmounted by a thicker epithelium; Small blood vessels cut across near the margin of the cornea
This is a result of the slippery lamellae sliding past each other when the corpuscle is structurally deformed by external pressure so that effects of sustained pressure are soon dissipated by the lamellae, abolishing deformation of the central axon terminal itself. [8] The capsule thus acts as a physiological high-pass filter. [3]
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Lamella, in cell biology, is also used to describe the leading edge of a motile cell, of which the lamellipodia is the most forward portion. [5] The lipid bilayer core of biological membranes is also called lamellar phase. [6] Thus, each bilayer of multilamellar liposomes and wall of a unilamellar liposome is also referred to as a lamella.
Copper disposition on corneal Descemet's membrane. Significant damage to the membrane may require a corneal transplant. Damage caused by the hereditary condition known as Fuchs dystrophy (q.v.)—where Descemet's membrane progressively fails and the cornea thickens and clouds because the exchange of nutrients/fluids between the cornea and the rest of the eye is interrupted—can be reversed by ...