Gross Anatomy of Eyelids Notable Features
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Questions and Answers

What is the function of eyelids in relation to light and radiation?

  • Form a barrier to reduce the amount of light and other radiation entering the eye (correct)
  • Enhance the effects of light and radiation on the eye
  • Contain specific pigments to absorb light and radiation
  • Increase the amount of light entering the eye
  • What marks the boundary of the tarsal plate in the eyelids?

  • Grey-line (correct)
  • Lacrimal puncta
  • Tarsal glands
  • Mucocutaneous junction
  • How do eyelids distribute tears over the ocular surface?

  • During blinking (correct)
  • By blocking tear production
  • By holding tears in separate ducts
  • By increasing tear evaporation
  • Which of the following tissues is NOT part of the structures of the eyelids?

    <p>Striated muscle (orbicularis oculi)</p> Signup and view all the answers

    Which part of the eyelid undergoes a change from keratinised epithelium to unkeratinised epithelium?

    <p>Tarsal plate</p> Signup and view all the answers

    Where does the epidermis of the skin change to unkeratinised epithelium of conjunctiva in the eyelids?

    <p>At the tarsal gland orifices</p> Signup and view all the answers

    What acts as a barrier to prevent the spread of orbital infections into the globe?

    <p>Intermuscular septa</p> Signup and view all the answers

    Where is the epicanthal fold commonly found?

    <p>Oriental and Asian races</p> Signup and view all the answers

    What marks the regions where the tissue of the eyelids is anchored to the facial bones?

    <p>Naso-jugal folds</p> Signup and view all the answers

    What divides each eyelid into orbital and tarsal portions?

    <p>Palpebral sulcus</p> Signup and view all the answers

    What creates the intraconal space by connecting the 4 recti muscles?

    <p>Intermuscular septa</p> Signup and view all the answers

    What covers increasing amounts of the upper cornea as age increases?

    <p>Upper lid</p> Signup and view all the answers

    Which part of the eyelids consists of a network of collagen & elastic fibers with numerous fine blood vessels & lymphatics?

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

    Which element subdivides the orbit into compartments by containing fibroblasts?

    <p>Intermuscular septa</p> Signup and view all the answers

    How are the eyelids separated from one another?

    <p>By palpebral sulcus</p> Signup and view all the answers

    Which structure connects the periorbita to Tenon's capsule & intermuscular membranes?

    <p>Intermuscular septa</p> Signup and view all the answers

    What is the function of the check ligament in relation to muscle action?

    <p>Prevents supraduction of the globe if septae become trapped</p> Signup and view all the answers

    Which structure envelops the EOM and connects the muscle segments to each other?

    <p>Check ligament</p> Signup and view all the answers

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