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The ciliary arteries are divisible into three groups, the long posterior, short posterior, and the anterior. * The short posterior ciliary arteries from six to twelve in number, arise from the ophthalmic as it crosses the optic nerve. * The long posterior ciliary arteries, two for each eye, pierce the posterior part of the sclera at some little distance from the optic nerve. * The anterior ciliary arteries are derived from the muscular branches of the ophthalmic artery. ==Additional images== File:Gray514.png|The ophthalmic artery and its branches File:Gray878.png|Iris, front view. File:Gray880.png|The terminal portion of the optic nerve and its entrance into the eyeball, in horizontal section. 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「Ciliary arteries」の詳細全文を読む スポンサード リンク
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