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جسم مژگانی - مرکز چشم پزشکی دکتر علیرضا نادری

جسم مژگانی

ساختمان چشم انسان

جسم مژگانی  Cilliary body

جسم مژگانی (ciliary body) بخش ضخیم لایه میانی (لایهٔ عروقی) چشم است که حد فاصل مشیمیه و عنبیه است.جسم مژگانی از ماهیچه مژگانی و زوائد مژگانی تشکیل شده‌است. جسم مژگانى (Ciliary Body) عضوى است با مقطع مثلثى که از يک ناحيه قدامى چين‌دار (Pars Plicata) و يک ناحيه خلفى مسطح (Pars Plana تشکيل شده است.

جسم مژگانی چشمcilliary body

مويرگ‌هاى آن برخلاف عنبيه داراى منافذ هستند لذا فلورسئين وريدى از آنها نشت مى‌کند. لايه بى‌رنگ داخلى اپى‌تليوم سيليارى ادامه لايه شبکيه عصبى و لايه رنگى خارجى آن ادامه لايه شبکيه عصبى و لايه رنگى خارجى آن ادامه لايه پيگمانته شبکيه است. زوائد مژگانى (پارس پليکا) مسئول ترشح زلاليه است. جسم مژگانى حاوى عضلات طولى (تغييردهنده اندازهٔ سوراخ‌هاى شبکيه ترابکولار) عضلات حلقوى (مسئول عمل تطابق) و عضلات شعاعى است. عروق و اعصاب جسم مژگانى مشابه عنبيه است.

سطح پشتی جسم مژگانی دارای فرورفتگی و برآمدگی‌های متناوب و منظمی است. از عمق فرورفتگی‌ها، رشته‌هایی به نام رباط آویزان‌کننده خارج شده، به عدسی می‌چسبد. سر دیگر این رشته‌ها به عضلات مژگانی چسبیده است. انقباض عضلات مژگانی باعث تغییر تحدب عدسی و تطابق می‌شود. این عضلات توسط اعصاب پراسمپاتیک زوج سوم، عصب‌دهی می‌شوند. در امتداد جسم مژگانی، عنبیه به شکل صفحه مدوری جلوی عدسی قرار گرفته و با تغییر قطر مردمک، میزان عبور نور به کره چشم را تنظیم می‌کند. در ضخامت عنبیه، دو دسته ماهیچه به شکل حلقوی (تنگ‌کننده) و شعاعی (گشادکننده) قرار گرفته‌اند.

فیلم ساختمان جسم مژگانی چشم Cilliary body video

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