1. Choroid: This nourishes the outer layers of the retina and prevents internal reflection.
   1. Internal Carotid Artery
      1. Ophthalmic Artery
         1. Anterior Ciliary Artery
            1. Recurrent branches
         2. Posterior Ciliary Artery
            1. Short Posterior
            2. This supplies the posterior Choroid.
            3. Long Posterior
            4. This Supplies the anterior region of the choroid.
   2. Uveal vessels
      1. provides nutrition and allows gas exchange.
   3. Vorticose Veins
      1. The Choroidal blood leaves the choroid and pierces the Sclera. The veins branch from the back surface of the eye and the ciliary body, the blood empties into the superior and inferior ophthalmic veins.
2. Retina: This senses light and creates impulses that travel via the optic nerve to the brain.
   1. Internal Carotid Artery
      1. Ophthalmic Artery
         1. Central Retinal Artery This supplies the Inner Laminae
            1. Topic
            2. Radial Peripapillary Capillaries (RPC)
            3. These are situated at the nerve fibre layer and are associated with the major superotemporal and inferotemporal vessels.
            4. Outer Capillaries
            5. These are parallel to the RPC and are found in the ganglion cell layer.
            6. Superior
            7. Nasal
            8. Temporal
            9. Inferior
            10. Nasal
            11. Temporal
            12. Inner Capillaries
            13. These travel form the inner plexiform layer to the outer plexiform layer.
   2. Central retinal vein
      1. supplies the inner laminae and drains blood from the capillaries of the retina into larger veins outside the eye. The vein exits via the Optic nerve and drains into the cavernous Sinus.
   3. Choroidal Capillaries
      1. These supply: the Rods and Cones Outer Laminae Outer Nuclear Layer They are fenestrated therefore slight resistance to allow the passage of small molecules.
      2. Choroidal blood leaves the eye by the vortex veins.
3. Optic Nerve: carries impulses from the retina to the brain.
   1. Pial Plexus
      1. Supplying the Orbital Portion, intracanlicular portion and the intracranial portion.
   2. Posterior Ciliary artery
      1. Short Posterior
         1. These pierce the sclera around the entrance of the optic nerve. This supplies the anterior optic nerve.
         2. Circle of Zinn & Haller: An elliptic circle around the optic nerve formed by the medial and lateral short posterior ciliary arteries.
            1. supplies the intraocular portion.
            2. Recurrent Pial branches
            3. Choroidal Branches
      2. Long Posterior
         1. These pierce the posterior part of the sclera, which then travel along either side of the eyeball towars the ciliary muscle.
   3. Choroidal arteries
      1. Supplies the anterior Optic nerve.
   4. Central Retinal Artery
      1. Supplies the axons on the Optic disc. This branches into four major vessels, each supplying one quadrant of the retina.
      2. Supplies the retrobulbar part of the nerve. This area is also supplied by the pial vessels.
   5. Central retinal Vein
      1. The venous drainage of the optic nerve. This passes through the anterior optic nerve and empties into the superior ophthalmic vein.