outer sheath of optic nerve

outer sheath of optic nerve
vagina externa nervi optici.

Medical dictionary. 2011.

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  • sheath — 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. SYN: vagina (1). 2. The prepuce of male animals, especially of the horse. 3. A specially designed tu …   Medical dictionary

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