Eye Anatomy


Eye Anatomy, Limbus Corneae, Iris, Conjunctiva, Aqueous Humor, Aqueous Outflow Angle

  • Images
  1. Globe
    1. eyeGlobeXsGrayBB869.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    2. eyeCorneaLensGrayBB883.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    3. eyeSagittalXsGrayBB888.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    4. eyeSagittalXsGrayBB891.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  2. Iris
    1. eyeIrisGrayBB875.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  3. Nerves
    1. See Neurologic Anatomy of the Eye
  4. Extraocular Motor
    1. See Extraocular Movement
  5. Choroid
    1. See Choroid Anatomy
    2. See Vascular Anatomy of the Eye
  6. Vessels
    1. See Vascular Anatomy of the Eye
  7. Retina
    1. See Retinal Anatomy
  8. Lacrimal and lids
    1. See Lacrimal Anatomy
  9. Lids
    1. See Lid Anatomy
  1. Eyelids
    1. Both lids contain a tarsal plate with Meibomian glands
    2. Lids join at medial and lateral canthi
  2. Sclera
    1. See Sclera
    2. Thick, protective outer coat of the eye underlying the Conjunctiva
    3. Normally white (with possible bluish discoloration) and opaque
    4. Scleral inflammation is very painful, and associated with Vision Loss
  3. Episclera
    1. Covers the anterior Sclera and lacks the Scleral bluish discoloration
    2. Continuous with the Cornea
    3. Episcleral inflammation is not typically painful, and does not cause vision change
  4. Limbus
    1. Corneal-Scleral junction
  5. Iris
    1. Pigmented light filter
    2. Muscular aperture of the eye controlling the size of the pupil
  6. Pupil
    1. Central hole or shutter within the iris
    2. Size is controlled by iris constriction (Miosis) and relaxation (Mydriasis)
    3. Size of the pupil determines amount of light exposure on the Retina
  7. Conjunctiva: Thin, vascular tissue
    1. Covers inner lid lining (palpebral Conjunctiva)
    2. Covers Sclera (bulbar Conjunctiva)
  8. Cornea
    1. See Refractive Error
    2. See Cornea
    3. Transparent front refractive window of eye
  9. Macula and Fovea
    1. Macula is fine central vision area at posterior pole
    2. Fovea is oval depression at center of Macula
  • Anatomy
  • Extraocular Muscles: Innervated by CN 3 with 2 exceptions
  1. See Extraocular Movement
  2. Medial Range of Motion
    1. Medial Rectus (Cranial Nerve III)
  3. Lateral Range of Motion
    1. Lateral Rectus (Cranial Nerve VI)
  4. Upward Range of Motion
    1. Superior Rectus (Cranial Nerve III)
    2. Inferior Oblique (Cranial Nerve III)
  5. Downward Range of Motion
    1. Inferior Rectus (Cranial Nerve III)
    2. Superior Oblique (Cranial Nerve IV)
  • Anatomy
  • Chambers
  1. Anterior Chamber
    1. Between Cornea and iris
    2. Contains Aqueous Humor
  2. Posterior Chamber
    1. Between iris and zonulae (very small space)
  3. Ciliary body
    1. Produces Aqueous Humor
    2. Suspends lens by zonulae
  4. Aqueous Humor related anatomy
    1. Aqueous Humor
      1. Clear fluid that fills anterior and posterior chamber
      2. Produced by ciliary body
      3. Passes through pupil
      4. Drains via trabecular meshwork (at outflow angle)
    2. Aqueous Outflow Angle
      1. Intersection of Cornea, iris, and ciliary body
      2. Blockage results in Glaucoma
  5. Vitreous Cavity
    1. Large space (4.5cc) between lens and Retina
    2. Contains transparent gel (vitreous humor)
  • Anatomy
  • Vascular
  1. Choroid
    1. Vascular pigmented tissue between Sclera and Retina
    2. Vascular supply for outer Retina
  2. Avascular structures of the eye
    1. Lens
    2. Anterior vitreous
    3. Corneal Endothelium