翻訳と辞書 Words near each other ・ Corneal ectatic disorders ・ Corneal endothelium ・ Corneal epithelium ・ Corneal hydrops ・ Corneal inlay ・ Corneal keratocyte ・ Corneal limbus ・ Corneal neovascularization ・ Corneal pachymetry ・ Corneal perforation ・ Corneal reflex ・ Corneal tattooing ・ Corneal topography ・ Corneal transplantation ・ Corneal ulcer ・ Corneal ulcers in animals ・ Cornealious Michael Anderson III ・ Corneanu ・ Corneau ・ Cornebarrieu ・ Corned beef ・ Corned beef knot ・ Corned beef pie ・ Corned beef sandwich ・ Cornedo ・ Cornedo Vicentino ・ Corneel Seys ・ Cornegliano Laudense ・ Cornehill ・ Corneilhan Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Corneal ulcers in animals ： ウィキペディア英語版 Corneal ulcers in animals A corneal ulcer, or ulcerative keratitis, is an inflammatory condition of the cornea involving loss of its outer layer. It is very common in dogs and is sometimes seen in cats. In veterinary medicine, the term ''corneal ulcer'' is a generic name for any condition involving the loss of the outer layer of the cornea, and as such is used to describe conditions with both inflammatory and traumatic causes. ==Corneal anatomy of the dog and cat== 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. The trigeminal nerve supplies the cornea via the long ciliary nerves. There are pain receptors in the outer layers and pressure receptors deeper. Transparency is achieved through a lack of blood vessels, pigmentation, and keratin, and through the organization of the collagen fibers. The collagen fibers cross the full diameter of the cornea in a strictly parallel fashion and allow 99 percent of the light to pass through without scattering. There are four important layers in the dog and cat cornea. The outer layer is the epithelium, which is 25 to 40 micrometers and five to seven cell layers thick.〔 The epithelium holds the tear film in place and also prevents water from invading the cornea and disrupting the collagen fibers. This prevents corneal edema, which gives it a cloudy appearance. It is also a barrier to infectious agents. The epithelium sticks to the basement membrane, which also separates the epithelium from the stroma. The corneal stroma comprises 90 percent of the thickness of the cornea.〔 It contains the collagen fibers organized into lamellae. The lamellae are in sheets which separate easily. Posterior to the stroma is Descemet's membrane, which is a basement membrane for the corneal endothelium. The endothelium is a single cell layer that separates the cornea from the aqueous humor. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Corneal ulcers in animals」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.