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بسم الله الرحمن الرحيم

بسم الله الرحمن الرحيم. ﴿و ما أوتيتم من العلم إلا قليلا﴾. صدق الله العظيم الاسراء اية 58. Physiology of Special Senses. By Dr. Abdel Aziz M. Hussein Lecturer of Medical Physiology Member of American Society of Physiology. Intraocular Fluids. Intraocular Fluids. Aqueous humour.

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بسم الله الرحمن الرحيم

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  1. بسم الله الرحمن الرحيم ﴿و ما أوتيتم من العلم إلا قليلا﴾ صدق الله العظيم الاسراء اية 58

  2. Physiology of Special Senses By Dr. Abdel Aziz M. Hussein Lecturer of Medical Physiology Member of American Society of Physiology Physiology of Special senses, Abdelaziz Hussein

  3. Intraocular Fluids

  4. Intraocular Fluids Aqueous humour Vitreous humour

  5. A) Aqueous Humour

  6. The Aqueous Humour Transparent colourless alkaline fluid that fills the anterior and posterior chambers of the eye

  7. The Aqueous Humour Mechanism of formation • Formed continuously by the Ciliary epithelium by facilitated diffusion and active transport mechanisms • Na by active transport • Cl and HCO3 and H2O follow Na passively • Rate • At a rate 1-2 µL/min

  8. The Aqueous Humour Composition

  9. The Aqueous Humour Circulation and drainage of aqueous humour

  10. The Aqueous Humour Functions

  11. B) Vitreous Humour

  12. Vitreous Body Hyaloid canal Retrolental space Capsule

  13. Vitreous Body Functions

  14. The Middle Layer or Uveal Tract

  15. Uveal Tract Choroid Iris Ciliary ms

  16. The Iris Iris

  17. The iris Muscles of the iris Radial or Dilator Pupillae ms Circular or Constrictor Pupillae ms

  18. Functions of the Iris The pigments of iris absorb all light rays which enter into the eye except though which pass through the pupil.

  19. Functions of the Iris 2. It prevents light from falling on the peripheral parts of the lens. Thus it preventsspherical and chromatic aberration

  20. Spherical Aberrations

  21. Chromatic Aberrations

  22. Functions of the Iris 3. It regulates the amount of light which enters into the eye by regulating the size of the pupil. 4. Pupillary constriction increases the depth of focus i.e. the distance of the object can be changed but its image is still focused on the retina without change in accommodation.

  23. Functions of the Ciliary Body 1. The ciliary muscle is essential for accommodation • 2. The ciliary processes secrete the aqueous humour into the posterior chamber & give attachment to the suspensory ligament of the lens.

  24. Functions of the Choroid 1. It is a vascular layer which provides blood supply to the eye • 2. The pressure inside its vessels maintains the intraocular pressure • 3. It contains melanin pigments which absorb light & prevent its reflection inside the eye which cause blurring of vision

  25. THANKS

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