Sclera Structure and Function Quiz
41 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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</p> Signup and view all the answers

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

    <p>Epiescleritis</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</p> Signup and view all the answers

    What causes scleral ectasia?

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

    What is the characteristic of scleral blood supply?

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

    What is the main component responsible for scleral opacity?

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

    What is the origin of the scleral layers?

    <p>Sclera</p> Signup and view all the answers

    What is the function of the anterior scleral foramen?

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

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

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

    What is the composition of the sclera?

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

    Where does scleral development begin?

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

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

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

    What is the main function of the sclera?

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

    Where is the thickest area of the sclera located?

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

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

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

    What is the weakest area of the sclera?

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

    What is the main function of the episclera?

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

    What is the composition of the inner lamina fusca?

    <p>Melanin</p> Signup and view all the answers

    From what tyoe of cells does the sclera develop?

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

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

    <p>Cornea</p> Signup and view all the answers

    To what is attached the episclera?

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

    Where are the larger episcleral vessels seen?

    <p>Conjunctiva</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</p> Signup and view all the answers

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

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

    To what does the anterior scleral spur attach to?

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

    Sclera opacity depends on all of these factors EXCEPT ONE

    <p>Air</p> Signup and view all the answers

    At what percent is sclera more dehydrated than cornea?

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

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

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

    What is the scleral color in newborns?

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

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

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

    What can the presence of a yellow sclera mean?

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

    What is the occupied by the posterior scleral foramen?

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

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

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

    More Like This

    Ocular Episclera and Sclera Anatomy
    5 questions
    De sclera van het oog
    8 questions
    Structures of the Eye
    18 questions
    Anatomy of the Eye: Sclera and Iris
    40 questions
    Use Quizgecko on...
    Browser
    Browser