The Optic Nerve Sheath Pathway

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Abstract
Anatomical and injection studies upon cadavers have demonstrated the continuity of the cranial subdural and subarachnoid spaces with the corresponding spaces around the optic nerve.* Experiments with living animals have shown that colloidal material and nondiffusible dyes injected in the cranial subarachnoid space reach the optic nerve sheath.† It is generally accepted that intracranial cerebrospinal fluid pressure is transmitted to the eye through the subarachnoid space around the optic nerve.7Transmission of particulate matter through the optic nerve sheath in vivo is suggested by filling of the sheath with inflammatory cells in cases of meningitis.7However, there is controversy as to whether blood from an intracranial subarachnoid hemorrhage fills the optic nerve sheath by direct extension3or whether the optic nerve sheath hemorrhages in this condition are a secondary phenomenon due to increased venous pressure‡ The following three cases are presented because they provide some additional evidence

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