盲點 (眼)

维基百科,自由的百科全书

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English: 1:posterior chamber 2:ora serrata 3:ciliary muscle 睫状肌 4:ciliary zonules 带状纤维 5:canal of Schlemm 6:pupil 瞳孔 7:anterior chamber 8:cornea 角膜 9:iris 虹膜 10:lens cortex 11:lens nucleus 12:ciliary process 13:conjunctiva 14:inferior oblique muscle 15:inferior rectus muscle 16:medial rectus muscle 17:retinal arteries and veins 18:optic disc 盲点 19:dura mater 20:central retinal artery 21:central retinal vein 22:optical nerve 23:vorticose vein 24:bulbar sheath 25:macula 26:fovea 27:sclera 巩膜 28:choroid 脉络膜 29:superior rectus muscle 30:retina 视网膜
English: 1:posterior chamber 2:ora serrata 3:ciliary muscle 睫状肌 4:ciliary zonules 带状纤维 5:canal of Schlemm 6:pupil 瞳孔 7:anterior chamber 8:cornea 角膜 9:iris 虹膜 10:lens cortex 11:lens nucleus 12:ciliary process 13:conjunctiva 14:inferior oblique muscle 15:inferior rectus muscle 16:medial rectus muscle 17:retinal arteries and veins 18:optic disc 盲点 19:dura mater 20:central retinal artery 21:central retinal vein 22:optical nerve 23:vorticose vein 24:bulbar sheath 25:macula 26:fovea 27:sclera 巩膜 28:choroid 脉络膜 29:superior rectus muscle 30:retina 视网膜

視網膜的後方稱為眼底,在正對視神經起始處,有一呈白色的圓形隆起,稱為視神經盤(又稱視神經乳頭)。此處是神經纖維進出的地方,沒有感光細胞,不能感應到光線,故稱為盲點影像能夠在盲點形成,但由於盲點沒有感光細胞,所以不能產生神經脈衝,令腦部不能得到影像形成。

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