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.