Describe the Structure,components and functions of the Uvea.
Function and location of cil body
Pars plicata protrusion= ciliary processes
Pars plic aka corona ciliaris
Roles of cil body in accommodation
3 groups of muscles:
Outer: longitudinal
Middle:Oblique/radial
Inner:circular
Unaccomodated eye:
Cil msc relaxed
Zonules stretched
Lens stretched》less curvature》less power
Accommodated eye
Cil msc contracts in
Zunules slaken
Lens thicker 》 more curvature》more power
Vascular and nervous supply of cil body
LPCA travels through sclera, choroid and forms major arterial circle of iris
Sympathetic =fight and flight》》 inhibit cil msc func》》 relax accomodation
Parasym=rest and digest》》 anti muscarinic drug relax accommodation
Which ciliary body component relates to aq production? Describe its structure
Ciliary processes
Structure: Stroma & 2 epi layers ( pigmented and non pigmented)
Inner non pigmented enables active transport of aq
which cil body component relates to zonules and vitreous synthesis?
Pars plana
Non pigmented
Where is the choroid situated? What is it?
Vascular layer of uveal tract
Attached to whole retina
Thin and loose connective tissue
Relate choroid structure and function
Highly vasc
nourishes outer ret》》 thickness of chor varies with bld volume
Regulates bld flow, influence iop
Contains melanin
Pig absorbs light; prevents stray light reflecting back
Describe the 4 layers of the choroid
Choroid func- nutritional support to outer ret
Bruchs mem aka lamina vitrea
Satlers layer 》 arterioles and venules
Hallers layer》major arteries and viens
Suprachoriodal space- for injections. Space may fill with fluid or bld
choroid innervation
long ciliary nerves - sensory fibres
Short cil nerves -originate from cil gang, carry sym, parasym, and sensory fibres
How to view the choroid and why is it important to view?
OCT
To identify and monitor oc diseases (AMD)
-neo vasc
-gaps in bruchs mem
-New vessel networks may cause oedema
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