Dictionary (n. pl.) The three membranes that envelop the brain and spinal cord; the pia mater, dura mater, and arachnoid membrane.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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