Ciliary body

CILIARY BODY ANATOMY-STRUCTURE
FUNCTION
INNERVATION

1. STRUCTURE AND FUNCTION OF CILIARY BODY Sathwara Sharvil

2. INTRODUCTION UVEA constitutes- middle vascular coat 3 parts- a)iris b)ciliary body c)choroid Developmentally,structurally and functionally- indivisible color varies from light blue to dark brown Sathwara Sharvil

3. EMBRYOLOGY CILIARY BODY Both Epithelium from neuroectoderm Ciliary processes from ciliary epithelium Stroma and blood vessels – mesoderm 9 TH WEEK GESTATION- ciliary body appears Sathwara Sharvil

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5. CILI A R Y B O D Y Forward continuation of choroid at ora serrata Triangular in cut section, ant side of its form part of angle , in middle attached to iris and outer part lies against sclera Triangle – two parts Anterior part- ciliary processes ( pars plicata ) 2-2.5mm Posterior part- smooth ( pars plana ) 5mm wide temporally & 3mm nasally MICROSCOPIC STRUCTURE 1.SUPRACILIARY LAMINA- outermost part Consist of pigmented collagen fibres Posteriorly continuation of suprachoroidal lamina, ant continous with anterior limiting membrane Sathwara Sharvil

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7. 2.STROMA- Consists Ciliary muscle- non striated, triangular in cut section, 3 parts Longitudnal/meridional fibres- origin from scleral spur, inserts into suprachoroidal lamina Circular fibres- in inner portion, nearest to lens Radial fibres- obliquely placed Actions - slacken suspensory ligament thus helps in accomodation circular fibres- directly as sphincter nerve supply- parasym. fibres from ciliary ganglion Sathwara Sharvil

8. Vascular stroma- major arterial circle lies Formed by anastomosis of long and short PCA Supplies iris and ciliary body 3)Layer of pigmented epithelium- forward continuation of RPE Anteriorly continues to pigmented epithelium of iris 4)Layer of non pigmented epithelium- forward continuation of sensory retina Continues anteriorly with pigmented epithelium of iris 5)Internal limiting membrane-lines NPE Frwd continuation of internal limiting membrane of retina Sathwara Sharvil

9. CILIARY PROCESSES Finger like projections from pars plicata 70-80 in number, 2mm long 0.5mm diameter Site of aqueous production ULTRASTRUCTURE 1)Network of capillaries- in the centre Has endothelium with fenestrae Stroma of ciliary processes- thin, separates capillaries from epithelium Epithelium-two layered with apical apposition Sathwara Sharvil

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11. FUNCTIONS OF CILIARY BODY Site of aqueous humour production Maintenance of IOP Constitutes blood aqueous barrier Accommodation Eicosanoids are synthesised in ciliary body Sathwara Sharvil

12. BLOOD SUPPLY UVEAL TRACT 1.SHORT POSTERIOR CILIARY ARTERIES Branches of ophthalmic artery Divides into 10-20 branches, pierce sclera around optic nerve Supply choroid in segmental manner 2) LONG POSTERIOR CILIARY ARTERIES Two in number- nasal and temporal Pierce sclera Anastomose with anterior ciliary arteries- form major arterial circle supply ciliary body 3)ANTERIOR CILIARY ARTERIES From muscular arteries 7 in number 2 each SR,IR,MR and 1 from LR Anastomse with LPCA Circulous arterious major and minor Sathwara Sharvil

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16. VENOUS DRAINAGE Anterior ciliary veins- tributaries of muscular veins Smaller veins from sclera- carry blood only from sclera and not from choroid Vena verticosae- 4 in no. Drain whole of choroid Sathwara Sharvil

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