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Anatomy of UVEA

 

The uveal tract comprises of the iris, ciliary body and choroid.

  1. IRIS
     
    Anterior most part
  1. Central an aperture of 3-4 mm called pupil
  2. Iris is thinnest at it root
  3. Entire frill of iris tissue -- collarette (represents attachment of pupillary membrane)-thickest
     
    Layers:
    1. Anterior limiting layer. has melanocytes definitive color of iris depends on this layer
    2. Stroma (contains vessels, nerves, sphincter pupillae, dilator pupillae muscle)
    3. Pigmented layer
    4. Non-pigmented layer
  4. Nerve Supply-
    1. Parasympathetic to sphincter pupillae by short ciliary nerve(III)
    2. Sympathetic-dilator pupillae (long ciliary nerve)
  5. Blood aqueous barrier –tight junctions between capillary endothelial cells of the iris
  1. Ciliary Body
    1. It’s a forward continuation of choroid at ora serrata
    2. 2 parts -   Pars plicata and Pars plana
    3. Plicata-2mm has 70 to 80 iris processes
    4. Epithelium – 2 layered Outer pigmented and Inner Non pigmented. Non pigmented layer responsible for   producing aqueous humour
    5. Contraction of ciliary muscle in CB responsible for accommodation (near vsion)
  2. Choroid
    1. Vacular layer from orraserrata to optic disc
    2. Layers-inside out-Bruch’s membrane, choriocapillaries, medium size vessels or sattler’s layer and large size vessels or Haller’s layer and suprachoroidal space
  1. Bruch’s membrane
  2. Choriocapillaries,
  3. Medium size vessels or Sattler’s layer and
  4. Large size vessels or Haller’s layer and
  5. Suprachoroidal space
  6. Bruchs membrane attached to RPE layer of retina
Blood Supply- Posterior ciliary arteries from Ophthalmic artery Venous drainage : Vortex veins





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