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ANATOMY OF SCLERA
• 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.
• 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.
• SCLERA HAS THREE LAYERS FROM OUTSIDE INWARD:
• A. EPISCLERA
• B. SCLERA PROPER
• C. LAMINA FUSCA
FUNCTION OF THE SCLERA
• IT PROTECTS THE EYEBALL BY RENDERING MECHANICAL STRENGTH AND SUPPORT.
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”.
NERVE SUPPLY
• IT IS RICHLY SUPPLIED BY SHORT CILIARY NERVES POSTERIORLY AND LONG CILIARY NERVES
ANTERIORLY
QUESTION BANK
• LAMINA FUSCA IS A PART OF
• A. CORNEA
• B. IRIS
• C. SCLERA
• D. RETINA
• . WHAT GIVES WHITE COLOUR TO EYES
• A. CONJUNCTIVA
• B. CORNEA
• C. SCLERA
• D. CHOROID
ANATOMY OF LIMBUS
LIMBUS
• IT IS THE TRANSITIONAL AREA BETWEEN THE CORNEA ON ONE SIDE AND SCLERA ALONG WITH
CONJUNCTIVA ON THE OTHER.
QUESTION BANK
• THE JUNCTION OF CORNEA AND SCLERA IS KNOWN AS
• A. TRABECULAR MESHWORK
• B. CILIARY BODY
• C. PUPIL
• D. LIMBUS

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ANATOMY OF SCLERA.pdf

  • 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
  • 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
  • 12. LIMBUS • IT IS THE TRANSITIONAL AREA BETWEEN THE CORNEA ON ONE SIDE AND SCLERA ALONG WITH CONJUNCTIVA ON THE OTHER.
  • 14. • THE JUNCTION OF CORNEA AND SCLERA IS KNOWN AS • A. TRABECULAR MESHWORK • B. CILIARY BODY • C. PUPIL • D. LIMBUS