Visual system

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    Created by
    Pierre Gasly

    Cards (66)

    • Choroid
      Highly vascular, provides nutrients and oxygen
      View source
    • What is the yellow spot
      The fovea
    • What is the blind spot
      The optic disk
    • What is the fibrous tunic made of
      The cornea and sclera
    • What type of fibres is the cornea made of
      Fibroblasts and collagen
    • What type of tissue is the slcera made of
      dense connective tissue
    • What type of tissue is the cornea made of
      dense connective
    • what type of fibres is the sclera made of
      fibroblasts and collagen
    • What are the main features of the cornea
      Avascularised.
      Transparent.
    • What makes the cornea transparent
      The regular arrangement of fibres with the same diameter
    • Why is the sclera opaque
      It has a random arrangement of fibres with different diameters.
    • How much light is refracted by the cornea
      2/3
    • How much light is refracted by the lens
      1/3
    • What is the effect of the transparency of the cornea
      IT produces constructive interference of light
    • What is the effect of the opaque of the sclera
      It results in destructive interference of light
    • What is the vascular tunic made of
      The choroid, ciliary body and iris
    • What does the iris do
      Regulates light entry by controlling the diameter of the pupil
    • What is the main feature of the choroid
      it is highly vascular
    • What is the ciliary body made of
      The ciliary muscles and process
    • Describe the response produced to bright light
      It is controlled by the parasympathetic nervous system.
      It causes contraction of the circular muscles of the iris, resulting in pupil constriction.
    • Describe the response to dim light
      Controlled by the sympathetic nervous system.
      Radial muscles of the iris contract causing the pupil to dilate.
    • What are the two cavities of the eye f
      Anterior and vitreous
    • What are the divisions of the anterior cavity of the eye
      Anterior and posterior
    • where is the anterior cavity
      In front of the lens
    • Where is the anterior chamber
      in front of the iris
    • where is the posterior chamber
      behind the iris
    • What is produced in the anterior cavity
      Aqueous humour
    • what is the role fo the ciliary processes
      To produce aqueous humour for the cornea and lens
    • where is the vitreous chamber
      between the lens and the retina
    • Label the Eye 

      X.
      A) Optic nerve
      B) Blood vessels
      C) Optic disk
      D) Fovea
      E) Sclera
      F) lens
      G) suspensory ligaments
      H) Cillary body
      I) Corena
      J) Pupil
      K) Iris
      L) Vitreous chamber
      M) Choroid
      N) Retina
    • How does aqueous humour exit the eye
      Via the scleral venous sinus
    • What is the other name for the scleral venous sinus
      Schlemm canal
    • What is the lens made of
      Crystallin proteins
    • What is the key feature of the lens
      It is transparent and avascularised
    • What are the zonular fibres often called
      The suspensory ligaments
    • What attaches to the suspensory ligmanents to control the lens
      The ciliary process
    • what shape is the lens to look at distance objects
      flat
    • How does the lens change to look far
      The ciliary muscles relax. Suspensory ligaments are taut. The lens is under tension and becomes flat.
    • What is the shape of the lens to look close
      round
    • How does the lens accommodate to look close
      Ciliary muscles contract. Suspensory ligaments relax. Lens becomes elastic and curves.
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