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Vagina of an optic nerve outside

Vagina of an optic nerve outside [vagina externa nervi optici – PNA (The anatomic nomenclature Parisian)] – the capillary space containing cerebrospinal liquid, and concluded between web and firm covers which cover an optic nerve.

 
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In Great Britain there is a law according to which the surgeon can refuse to do to the patient operation if he smokes or has excess weight. The person has to refuse addictions, and then, perhaps, he will not need an operative measure.