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Corneal Tissue
Corneal tissue is extremely special because of the presence of transparency, avascularity, presence of immature resident immune cells and also because of immunologic privilege.
There is no blood supply in the corneal eye tissue and this tissue actually gets its oxygen directly from the air. The border of the corneal eye tissue is formed by sclera at the corneal limbus. The protein that is most abundantly found in the mammalian cornea is known as albumin. The corneal eye tissue in humans is made of different layers. When going from the anterior direction to the posterior side, these five layers of the human cornea are Corneal epithelium, Bowman’s layer, Corneal Stroma, Descemet’s membrane and corneal endothelium. Corneal epithelium is a thin epithelial multicellular tissue layer and it is composed of fast-growing and easily regenerated cells. These cells are generally kept moist because of tears. The smoothness of the air-tear film interface is generally disrupted by the irregularity of edema. This epithelium is generally continuous with the conjunctivital epithelium and the layers of the cells generally shed constantly on the exposed layer. Bowman’s layer is a tough layer and is involved in protecting the corneal stroma. The middle layer which is thick in nature is the Corneal stroma. It consists of the regularly arranged collagen fibers. These are generally along the sparsely distributed interconnected keratocytes. The other two layers are Descemet’s membrane and the Corneal endothelium.
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