marginal mandibular branch of facial nerve

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mar·gi·nal man·dib·u·lar branch of fa·cial nerve

branch of parotid plexus of facial nerve that parallels the mandibular margin innervating the risorius muscle and muscles of lower lip and chin.
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2 In surgical/cosmetic procedures such as parotidectomy excision of submandibular gland mandibular advancement procedures deep neck dissection carotid endarterectomy peri-oral rhytidec- tomy and liposuction procedures; the chances of injury to marginal mandibular branch of facial nerve are high.
The Marginal Mandibular branch of Facial Nerve was traced forwards from the lower border of the Parotid Gland to the depressor anguli oris.