Dictionary 1. (n.) The delicate outer sheath of a nerve fiber; the primitive sheath.2. (n.) The perineurium. Thesaurus allantoic membrane amniotic sac arachnoid membrane basement membrane conjuctiva eardrum hymen maidenhead membrana serosa membrana tympana membrane meninges meninx neurilemma pellicle pericardium perineurium pleura serosa tympanic membrane tympanum velum |
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