Lens Formation and Differentiation Quiz
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Questions and Answers

Which signals are required for complete lens differentiation?

  • Inhibitory signals from the cranial neural crest
  • Signals from the surface ectoderm
  • Signals from the optic vesicle (correct)
  • Signals from the anterior neural plate

    • What is the role of the cranial neural crest in lens formation?

  • It directly contacts the optic vesicle
  • It gives the ectoderm a lens-forming bias
  • It suppresses any residual lens-forming bias (correct)
  • It forms the basement membranes

    • What is the relationship between the optic vesicle and surface ectoderm during lens formation?

  • They adhere through an extracellular matrix (correct)
  • There is no contact at all
  • There is direct cell contact
  • The basement membranes fuse together

    • When does the thickening of the lens placode occur in dogs?

    <p>Day 17</p> Signup and view all the answers

    What has been described as a tight, extracellular matrix-mediated adhesion between the optic vesicle and the surface ectoderm?

    <p>The basement membranes</p> Signup and view all the answers

    Which area of ectoderm first becomes competent to respond to lens inducers?

    <p>The surface ectoderm adjacent to the lens</p> Signup and view all the answers

    What is the role of inhibitory signals from the cranial neural crest in lens formation?

    <p>They suppress any residual lens‐forming bias in head ectoderm adjacent to the lens</p> Signup and view all the answers

    What is the relationship between the basement membranes of the optic vesicle and the surface ectoderm during lens formation?

    <p>They remain separate and intact</p> Signup and view all the answers

    When does the thickening of the lens placode occur in dogs?

    <p>On day 17</p> Signup and view all the answers

    What type of adhesion has been described between the optic vesicle and the surface ectoderm?

    <p>Extracellular matrix-mediated adhesion</p> Signup and view all the answers

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