OCULAR ANATOMY

1. ANATOMY OF SCLERA

2. • SCLERA FORMS THE TOUGH, WHITE, OPAQUE POSTERIOR 5/6TH OF THE EXTERNAL FIBROUS
COAT OF THE EYEBALL.
• ITS WHOLE OUTER SURFACE IS COVERED BY TENON'S CAPSULE.
• . IN THE ANTERIOR PART IT IS ALSO COVERED BY BULBAR CONJUNCTIVA.

3. • SCLERA IS THICKEST POSTERIORLY (1MM) AND GRADUALLY BECOMES THIN WHEN TRACED
ANTERIORLY.
• IT IS THINNEST AT THE INSERTION OF EXTRAOCULAR MUSCLES (0.3 MM).
• LAMINA CRIBROSA IS A SIEVE-LIKE SCLERA FROM WHICH FIBRES OF OPTIC NERVE PASS.

4. • SCLERA HAS THREE LAYERS FROM OUTSIDE INWARD:
• A. EPISCLERA
• B. SCLERA PROPER
• C. LAMINA FUSCA

5. FUNCTION OF THE SCLERA
• IT PROTECTS THE EYEBALL BY RENDERING MECHANICAL STRENGTH AND SUPPORT.

6. BLOOD SUPPLY
• IT IS RELATIVELY AVASCULAR.
• HOWEVER, A RICH VASCULAR PLEXUS IS FORMED BY EPISCLERAL AND CHOROIDAL VESSELS,
ANTERIOR TO THE INSERTION OF THE RECTUS MUSCLES OF THE EYE.
• THE CONGESTION OF THESE VESSELS IS THE BASIS OF THE CLINICAL SIGN “CILIARY
CONGESTION”.

7. NERVE SUPPLY
• IT IS RICHLY SUPPLIED BY SHORT CILIARY NERVES POSTERIORLY AND LONG CILIARY NERVES
ANTERIORLY

8. QUESTION BANK

9. • LAMINA FUSCA IS A PART OF
• A. CORNEA
• B. IRIS
• C. SCLERA
• D. RETINA

10. • . WHAT GIVES WHITE COLOUR TO EYES
• A. CONJUNCTIVA
• B. CORNEA
• C. SCLERA
• D. CHOROID

11. ANATOMY OF LIMBUS

12. LIMBUS
• IT IS THE TRANSITIONAL AREA BETWEEN THE CORNEA ON ONE SIDE AND SCLERA ALONG WITH
CONJUNCTIVA ON THE OTHER.

13. QUESTION BANK

14. • THE JUNCTION OF CORNEA AND SCLERA IS KNOWN AS
• A. TRABECULAR MESHWORK
• B. CILIARY BODY
• C. PUPIL
• D. LIMBUS