眼球纖維膜(英語:Fibrous tunic)為眼球壁的外層(中層為血管膜,內層為神經膜),是強韌的緻密結締組織構成的被膜,具有支持眼球形態和保護眼球內容物的作用。
眼球纖維膜可分為前段為透明的角膜,以及後段不透明的鞏膜兩部分;前者佔1/6,後者佔5/6;兩者可合稱角鞏膜(corneosclera)[1]。
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