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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Prog Retin Eye Res. 2016 Jan;50:108–144. doi: 10.1016/j.preteyeres.2015.10.001

Fig. 2.

Fig. 2

Longitudinal section of a normal human optic nerve showing the sheath in its different parts. Abbreviations: A= Arachnoid; C = Choroid; D = Dura, OC = Optic canal; ON = Optic nerve; P = Pia; R = Retina; S = Sclera. (Reproduced from Hayreh SS. 1965a)