Anatomy of the Eye
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Questions and Answers

What is the main function of the aqueous humour in the anterior cavity?

  • To provide nutrition and immunity to the avascular ocular tissues (correct)
  • To provide mechanical support to the cornea and lens
  • To control the amount of light entering the eye
  • To regulate the movement of the iris and pupil

    • What is the percentage of water in the aqueous humour?

  • 95%
  • 90%
  • 98% (correct)
  • 99%

    • What is the name of the pathway through which the aqueous humour drains out of the eye?

  • Trabecular meshwork
  • Uveoscleral pathway
  • Canal of Schlemm
  • All of the above (correct)

    • What is the name of the layer sandwiched between the sclera and the retina?

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

    What is the name of the fluid that fills the vitreous chamber?

    <p>Vitreous humour</p> Signup and view all the answers

    What is the name of the anatomical structure that forms the pupil?

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

    What is the name of the section of the eye that includes the anterior and posterior chambers?

    <p>Anterior cavity</p> Signup and view all the answers

    What is the name of the pathway that provides a small amount of refraction in the eye?

    <p>Aqueous humour pathway</p> Signup and view all the answers

    What is the main composition of the vitreous humour?

    <p>99% water, with some cells, salts, sugars, and collagen fibrils</p> Signup and view all the answers

    What is the function of the crystalline lens in the eye?

    <p>To provide variable refractive power, allowing the eye to focus on objects at different distances</p> Signup and view all the answers

    What is the function of the vitreous humour in the eye?

    <p>To provide support for the eyeball and additional refractive power</p> Signup and view all the answers

    What is the structure that covers the entire surface of the lens?

    <p>Elastic capsule</p> Signup and view all the answers

    What is the name of the cavity located behind the lens and in front of the retina?

    <p>Vitreous chamber</p> Signup and view all the answers

    What is the purpose of the zonules in the eye?

    <p>To hold the lens in place</p> Signup and view all the answers

    What happens to the vitreous humour with age?

    <p>It starts to liquify and the collagen fibres degrade</p> Signup and view all the answers

    What is the location of the posterior cavity?

    <p>Behind the lens and in front of the retina</p> Signup and view all the answers

    What is the main component of the vitreous humour?

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

    What is the chamber of the eye that contains the vitreous humour?

    <p>Vitreous chamber</p> Signup and view all the answers

    What is the main difference between the vitreous humour and the aqueous humour?

    <p>The vitreous humour is more viscous</p> Signup and view all the answers

    What is the structure that separates the anterior and posterior cavities of the eye?

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

    What is the consequence of the collagen fibres breaking in the vitreous humour?

    <p>Small floaters or complete posterior vitreous detachment</p> Signup and view all the answers

    What is the term for the variable refractive power of the crystalline lens?

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

    Which of the following is NOT a part of the ocular anatomy?

    <p>Adrenal gland</p> Signup and view all the answers

    What is the part of the eye that controls the amount of light entering the eye?

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

    Study Notes

    Anterior Cavity

    • The anterior chamber is a space between the cornea and iris, approximately 3 mm in depth.
    • It is filled with aqueous humour, a transparent fluid that provides nutrition, immunity, and support to avascular ocular tissues.
    • Aqueous humour is 98% water and contains amino acids, glucose, and few proteins.
    • It constantly circulates, being secreted by the ciliary body and draining out through the trabecular meshwork and uveoscleral pathway.

    Posterior Chamber

    • The posterior chamber is the space between the iris and lens.
    • The aqueous humour also extends into the posterior chamber.
    • The anterior and posterior chambers together form the anterior cavity (also known as the anterior segment).

    Uvea

    • The uvea is made up of three parts: the choroid, ciliary body, and iris.
    • The uvea gets its name from the Latin word for "grape" due to its dark red, wrinkled, and grape-like appearance when removed.

    Choroid

    • The choroid is a vascular layer sandwiched between the sclera and retina.

    Vitreous Chamber

    • The vitreous chamber is the largest of the three chambers, located behind the lens and in front of the retina.
    • It is filled with vitreous humour, also known as the vitreous body.
    • Vitreous humour is a clear gel that is 99% water, with some salts, sugars, and a network of collagen fibrils that make it gel-like.

    Vitreous Humour

    • Vitreous humour provides support for the eyeball and additional refractive power.
    • With age, the collagen fibres degrade, and the vitreous humour starts to liquify.
    • The fibres holding the surrounding membrane to the retina can break, potentially leading to small floaters or even complete posterior vitreous detachment.

    Pupil

    • The pupil is the dark circular opening in the centre of the iris that controls the amount of light entering the eye.
    • Pupil size varies in diameter (from 2 to 8 mm) depending on the amount of light present.
    • Pupil abnormalities can be indicative of a wide range of ocular and neural pathologies.

    Lens

    • The crystalline lens provides variable refractive power, allowing the eye to focus on objects at different distances.
    • It consists of three concentric layers: an elastic capsule, a simple epithelium, and the bulk of the lens made of elongated cells (lens fibres).
    • The lens fibres make up the majority of the lens and provide its refractive power.

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    Related Documents

    OV1113_OcularAnatomyAndPhysiology_pj_v1_2_c (1).pptx

    Description

    Learn about the different parts of the eye, including the iris, pupil, and sclera, and their functions.

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