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Pterygium refers to any winglike triangular membrane occurring in the neck, eyes, knees, elbows, ankles or digits. In the eye, a pinguecula is called a pterygium if it invades the cornea. The term comes from the Greek word ''pterygion'' meaning "wing". ==Types== * Popliteal pterygium syndrome, which affects the legs. * Pterygium (conjunctiva) A pterygium grows in response to exposure to ultraviolet light. They are more common in light-skinned people living nearer the equator, particularly where outdoor activities are popular. As the pterygium grows, it replaces the corneal epithelium, and erodes the superficial layers beneath it. These layers are Bowman's membrane, and the anterior corneal stromal lamellae. The pterygium pulls and distorts the cornea as it enlarges. 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「pterygium」の詳細全文を読む スポンサード リンク
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