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Anatomy of the Retina
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Anatomy of the Retina

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Questions and Answers

What is the main function of the choroid in the eye?

  • To provide a rich blood supply to the retina (correct)
  • To transmit light signals to the brain
  • To regulate the amount of light entering the eye
  • To absorb light and prevent it from scattering
  • What is the pathway of light through the retina?

  • Ganglion cells → bipolar cells → photoreceptors
  • Photoreceptors → ganglion cells → bipolar cells
  • Photoreceptors → bipolar cells → ganglion cells (correct)
  • Bipolar cells → photoreceptors → ganglion cells
  • Which type of photoreceptor is responsible for peripheral and night vision?

  • Bipolar cells
  • Rods (correct)
  • Ganglion cells
  • Cones
  • What percentage of all sensory receptors are found in the eyes?

    <p>70 percent</p> Signup and view all the answers

    How many nerve fibers are found in each eye?

    <p>Over 1 million nerve fibers</p> Signup and view all the answers

    Which structure is responsible for regulating the amount of light entering the eye?

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

    What is the primary function of the bony orbit?

    <p>To protect the eye</p> Signup and view all the answers

    What is the function of the pigmented layer in the retina?

    <p>To absorb light and prevent it from scattering</p> Signup and view all the answers

    What is the purpose of the conjunctiva?

    <p>To protect the eye</p> Signup and view all the answers

    What is the site where the conjunctiva merges with the cornea?

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

    What is the function of the ciliary body in the eye?

    <p>To attach the lens to the eye via the ciliary zonule</p> Signup and view all the answers

    What is the function of the lacrimal apparatus?

    <p>To produce tears</p> Signup and view all the answers

    What is the region of the retina that is lateral to the blind spot?

    <p>Area with only cones</p> Signup and view all the answers

    What is the name of the region where the eyelid meets the eye?

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

    What is the function of the fovea centralis?

    <p>To provide the sharpest vision</p> Signup and view all the answers

    In which area of the retina are there no photoreceptor cells?

    <p>Optic disc</p> Signup and view all the answers

    What is the function of the extrinsic eye muscles?

    <p>To move the eye</p> Signup and view all the answers

    What is the location of the densest concentration of cones in the retina?

    <p>Center of the retina</p> Signup and view all the answers

    What is the function of the rods in the retina?

    <p>Allow vision in dim light and peripheral vision</p> Signup and view all the answers

    What is the purpose of the suspensory ligament in the eye?

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

    What is the structure of the lens in the eye?

    <p>Biconvex crystal-like structure</p> Signup and view all the answers

    What is the purpose of the pigment layer in the retina?

    <p>To absorb light and prevent glare</p> Signup and view all the answers

    Study Notes

    Structure of the Eye

    • The eye has a pigmented layer of retina, central artery, and vein of retina.
    • The optic disc is located at the back of the eye.
    • The sclera is the outer layer of the eye.
    • The optic nerve is connected to the eye.

    Sensory Layer

    • The retina has two types of neurons: rods and cones.
    • Rods are found towards the edges of the retina, allow vision in dim light and peripheral vision, and perceive in gray tones.
    • Cones are densest in the center of the retina, allow for detailed color vision, and are found in the fovea centralis.
    • There are no photoreceptor cells at the optic disc, or blind spot.

    Lens

    • The lens is a biconvex crystal-like structure held in place by a suspensory ligament attached to the ciliary body.

    Special Senses

    • The five special senses are smell, taste, sight, hearing, and equilibrium.

    The Eye and Vision

    • 70 percent of all sensory receptors are in the eyes.
    • Each eye has over 1 million nerve fibers.
    • The eye is protected by a bony orbit and a cushion of fat.

    Accessory Structures of the Eye

    • The accessory structures of the eye include eyelids and eyelashes, conjunctiva, lacrimal apparatus, and extrinsic eye muscles.

    Surface Anatomy of the Eye and Accessory Structures

    • The conjunctiva merges with the cornea at the limbus.
    • The eyelids and eyelashes protect the eye.
    • The lacrimal caruncle is located at the medial commissure.

    Vascular Layer

    • The choroid is a blood-rich nutritive layer in the posterior of the eye.
    • The choroid is modified anteriorly into two structures: ciliary body and iris.
    • The iris regulates the amount of light entering the eye and gives the eye its color.

    Retina

    • The retina contains two layers: outer pigmented layer and inner neural layer.
    • The outer pigmented layer absorbs light and prevents it from scattering.
    • The inner neural layer contains receptor cells (photoreceptors) including rods and cones.

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    Related Documents

    LEC13 SPECIAL SENSES (1).pdf

    Description

    This quiz covers the structure and components of the retina, including the pigmented layer and central artery and vein.

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