Excorticate is a medical term that means to remove the bark or skin from a nerve, organ or any other body part. The term has no commonly used antonyms, but a few words that could be considered opposite in meaning to excorticate are cover, protect, defend, and shield.
Cover and protect both imply providing a layer of insulation or a protective barrier to keep something from being exposed or damaged. Defend and shield suggest actively protecting someone or something from harm or danger. In medical terms, synonyms for excorticate are denervate, dissect, and exarticulate. antonyms for excorticate in the context of skin may include cover, wrap, dress, or patch up.