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Fig. 1: Schematic representation of blood supply of: (A) the optic nerve head and (B) the optic nerve.
Abbreviations: A = arachnoid; C = choroid; CRA = central retinal artery; Col. Br. = Collateral branches; CRV = central retinal vein; D = dura; LC = lamina cribrosa; NFL = surface nerve fiber layer of the disc; OD = optic disc; ON = optic nerve; P = pia; PCA = posterior ciliary artery; PR and PLR = prelaminar region; R = retina; RA = retinal arteriole; S = sclera; SAS = subarachnoid space.
(A reproduced from Hayreh 1978 . B modified from Hayreh, S.S. 1974 )