1. Choroid
   1. Arterial Supply
      1. Ophthalmic Artery
         1. Posterior Ciliary Arteries
            1. Long posterior ciliary arteries
            2. Short posterior ciliary arteries
         2. Muscular branches
            1. Anterior ciliary arteries
            2. Major arterial circle
   2. Venous Drainage
      1. Vortex Veins
         1. Superior vortex veins
            1. Superior Ophthalmic vein
            2. Cavernous Sinus
         2. Inferior vortex veins
            1. Inferior Ophthalmic Vein
            2. Pterygoid Plexus
2. Retina
   1. Inner Retina
      1. Ophthalmic Artery
         1. Central Retinal Artery
            1. Superior temporal
            2. Superior nasal
            3. Inferior temporal
            4. Inferior nasal
            5. Arterial intraretinal branches
            6. Capillary layers
            7. 1. Radial Peripapillary capillaries
            8. inner part of nerve fibre layer
            9. 2. Inner layer of capillaries
            10. Ganglion cell layers
            11. 3. Outer layer of capillaries
            12. Inner Plexiform layer to Outer plexiform layer
            13. Venous Drainage
            14. 1. Precapillary venules
            15. 2. Venules
            16. 3. Central Retinal Vein
            17. 4. Superior Ophthalmic Vein / Cavernous Sinus
   2. Outer Retina
      1. Choroid
         1. Choroidal Blood Vessels
            1. Long ciliary arteries
            2. Short ciliary arteries
            3. Zinns circle
            4. Cilioretinal artery
            5. Choriocapillaries
3. Optic Nerve
   1. Intraocular portion
      1. Supplied by branches of Circle of Zinn
         1. Supplied by short posterior ciliary arteries
   2. Orbital Portion
      1. Supplied by Plial plexus of vessels
         1. Supplied by neighbouring branches of ophthalmic artery
      2. Central Retinal Artery
      3. Drainage
         1. Into central retinal vein
   3. Intracanalicular portion
      1. Supplied by branches of Plial plexus
         1. Supplied by recurrent branches from ophthalmic artery
   4. Intracranial portion
      1. Plial plexus
         1. Superior Hypophyseal Artery
         2. Ophthalmic Artery
      2. Drainage
         1. Basal Veins
         2. Anterior cerebral vein