Sclera Structure and Function Quiz
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Questions and Answers

What is the scleral color in healthy individuals?

  • Blue
  • White (correct)
  • Transparent
  • Yellow

Which structure is the origin of the longitudinal ciliary muscle fibers?

  • Scleral opacity
  • Scleral canals
  • Posterior scleral spur (correct)
  • Scleral foraminas

What is the function of the posterior apertures in the scleral canals?

  • Carry nerves and vessels
  • Passage for the posterior ciliary arteries and nerves (correct)
  • Passage for the anterior ciliary vessels
  • Carry the vortex veins

What is the main source of nourishment for the sclera?

<p>Episcleral, choroidal vessels and braches of the long posterior ciliary arteries (C)</p> Signup and view all the answers

What condition is characterized by benign inflammatory congestion of the episcleral network?

<p>Epiescleritis (D)</p> Signup and view all the answers

Which condition may be the presenting sign of severe systemic disease and involves granulomatous inflammation of the scleral collagen or vasculitis?

<p>Scleritis (B)</p> Signup and view all the answers

What causes scleral ectasia?

<p>Axial elongation in high myopic eye (B)</p> Signup and view all the answers

What is the characteristic of scleral blood supply?

<p>Considered avascular (C)</p> Signup and view all the answers

What is the main component responsible for scleral opacity?

<p>Collagen fibrils (B)</p> Signup and view all the answers

What is the origin of the scleral layers?

<p>Sclera (B)</p> Signup and view all the answers

What is the function of the anterior scleral foramen?

<p>Area occupied by the cornea (B)</p> Signup and view all the answers

What is the function of the middle apertures in the scleral canals?

<p>Carry the vortex veins (A)</p> Signup and view all the answers

What is the composition of the sclera?

<p>Episclera, stroma, inner lamina fusca (A)</p> Signup and view all the answers

Where does scleral development begin?

<p>Week 7 (D)</p> Signup and view all the answers

What is the thickness of the thinnest area of the sclera at the EOM rectal muscle insertion?

<p>0.3mm (D)</p> Signup and view all the answers

Which layer of the sclera is continuous with the corneal stroma?

<p>Scleral stroma (C)</p> Signup and view all the answers

What forms a capillary network in the episclera just anterior to the rectus muscle insertions?

<p>Branches of the anterior ciliary arteries (C)</p> Signup and view all the answers

What is the main function of the sclera?

<p>Maintains the shape of the globe (B)</p> Signup and view all the answers

Where is the thickest area of the sclera located?

<p>At the posterior pole (C)</p> Signup and view all the answers

What type of collagen fibers make up the majority in the sclera?

<p>Type I (D)</p> Signup and view all the answers

What is the weakest area of the sclera?

<p>Lamina cribosa (D)</p> Signup and view all the answers

What is the thickness of the thickest area of the sclera at the posterior pole?

<p>1.0mm (D)</p> Signup and view all the answers

What is the main function of the episclera?

<p>Loose, vascularized connective tissue layer (B)</p> Signup and view all the answers

What is the composition of the inner lamina fusca?

<p>Melanin (A)</p> Signup and view all the answers

From what tyoe of cells does the sclera develop?

<p>Periocular mesenchymal cells (A)</p> Signup and view all the answers

What happens at the third month of sclera development?

<p>Extends in the posterior pole to form the lamina cribosa (C)</p> Signup and view all the answers

What is known as the 5/6th and is the protective connective tissue of the eye globe?

<p>Sclera (C)</p> Signup and view all the answers

All of these are part of the sclera. SELECT ONE that is not

<p>Cornea (D)</p> Signup and view all the answers

To what is attached the episclera?

<p>Tenons Capsule (C)</p> Signup and view all the answers

Where are the larger episcleral vessels seen?

<p>Conjunctiva (B)</p> Signup and view all the answers

Which arteries form a capillary network anterior to the rectus muscle insertions and surround the peripheral cornea?

<p>Anterior ciliary arteries (A)</p> Signup and view all the answers

With does the innermost aspect of the stromal ground surface merges to?

<p>Choroidal tissue (suprachoroid layer) (A)</p> Signup and view all the answers

To what does the anterior scleral spur attach to?

<p>Trabecular Meshowrk (C)</p> Signup and view all the answers

Sclera opacity depends on all of these factors EXCEPT ONE

<p>Air (D)</p> Signup and view all the answers

At what percent is sclera more dehydrated than cornea?

<p>68% (B)</p> Signup and view all the answers

What fraction of the GAGs in the cornea does sclera have?

<p>1/4 (D)</p> Signup and view all the answers

What is the scleral color in newborns?

<p>Blue and uvea shows (C)</p> Signup and view all the answers

A patient walks in with blue sclera. What could this mean?

<p>Scleral thinning (D)</p> Signup and view all the answers

What can the presence of a yellow sclera mean?

<p>liver disease and fatty deposits (A)</p> Signup and view all the answers

What is the occupied by the posterior scleral foramen?

<p>Optic nerve bridged by lamina cribosa (D)</p> Signup and view all the answers

Which is the possible route for entry and exits of diseases in the eye?

<p>Scleral canals (A)</p> Signup and view all the answers

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