Marginal mandibular branch of facial nerve. The marginal mandibular branch of the facial nerve arises from the facial nerve (CN VII) in the parotid gland at the parotid plexus. The marginal mandibular branch of the facial nerve is a motor nerve that innervates muscles of facial expression in the lower face. 2,3 The most frequent cause of affection of this nerve is iatro-genic injury during operations in the mandibular or parotid re-gions. It innervates the muscles responsible for controlling the lower lip and chin movements, playing a vital role in facial expressions and speech. The marginal mandibular branch of the facial nerve is at risk for injury in transfacial approaches to expose the posterior and lateral surfaces of the mandibular ramus (submandibular, retromandibular, facelift approaches). The marginal mandibular branch controls muscles of the chin and lower lip so the lower lip on the side of the weakness may not move properly. It passes anterior-ward deep to the platysma and depressor anguli oris muscles. Injury to the marginal mandibular nerve is . Studies assessing accurate anatomical landmarks of the Information on lower lip weakness or paralysis from injury to the marginal mandibular branch of the facial nerve. Apr 21, 2020 · The marginal mandibular branch is one of the terminal branches of the mandibular division of the facial nerve. 6% of specimens and with the buccal branch of the facial nerve in 40%, also with the anterior branch of the great auricular nerve in 3. Keywords: branching pattern; facial nerve; marginal mandibular branch; variants. After injury nerve healing and repair may occur over time. It sends branchial motor efferents. The marginal mandibular branch (ramus marginalis mandibulæ) passes forward beneath the Platysma and Triangularis, supplying the muscles of the lower lip and chin, and communicating with the mental branch of the inferior alveolar nerve. Iatrogenic injury to the marginal mandibular branch (MMB) during surgery of the neck often results in disorders of facial expression and has been an important reason of medicolegal actions [8]. The risk of iatrogenic lesions of the MMB is conditioned by two important aspects: its anatomical variability and large number of surgical interventions at that level. The lowest variation degree was determined in Type I and in MCT, without gender differences. Jul 27, 2021 · Background Marginal mandibular nerve is a terminal branch of the extracranial part of the facial nerve and leaves the parotid from its antero-inferior border and travels beneath the platysma muscle and deep cervical neck fascia, after which its course becomes superficial to the facial vessels. It leaves the anterior–inferior border of the parotid gland, makes a curve down to the submandibular gland, and runs along the angle and inferior border of the mandible. The MMBr has been described as coursing superior to the inferior border of the mandible. It has been postulated that the embalming process may effect its Dec 31, 2023 · Abstract The Marginal Mandibular Nerve, a branch of the seventh cranial nerve (facial nerve), exhibits notable variability in its branching and course. Although surface landmarks such as the Pitanguy line 1 and Zuker point 2 have been described in the literature (and are commonly used) for the temporal and buccal branches of the facial nerves, respectively, no such surface landmark exists for the marginal mandibular nerve, which along with the temporal branch of the facial nerve, is a common Mar 29, 2016 · The marginal mandibular branch (Mbr) of the facial nerve is vulnerable to damage during rhytidoplasty, surgical reduction of the mandibular angle, parotidectomy, and excision of the submandibular gland. The marginal mandibular branch of the facial nerve is vulnerable to iatrogenic injuries during surgeries involving the submandibular region. From these five major branches of the facial nerve, the marginal mandibular branch of the fa-cial nerve (MMBFN) supplies all the muscles of the lower lip. See full list on radiopaedia. The marginal mandibular branch of the facial nerve was found superficial to the facial artery and (anterior) facial vein in all the cases (100%). This leads to significant post-operative morbidity. 3%, and with the transverse cervical nerve in 3. Thus the facial artery can be used as an important landmark in locating the marginal mandibular nerve during surgical procedures. Feb 1, 2024 · The marginal mandibular nerve, also known as the marginal branch of the facial nerve, is a crucial component of the facial nerve network. org The Marginal Mandibular Branch of the Facial Nerve refers to a nerve that runs below the angle of the mandible and then above the body of the mandible to provide innervation to the muscles of the chin, such as depressor anguli oris and depressor labii inferioris. Surgery or trauma of the face or upper neck put this nerve branch at risk. 3% of specimens. Jun 1, 2014 · There are communications either between the main or the secondary branches of the marginal mandibular nerve itself in 53. The facial nerve's main trunk and its two major divisions (temporofacial and cervicofacial) cross the mandibular ramus's posterior border in the subcondylar region. However, studies have reported variations in its location in embalmed and fresh specimens. The Dec 16, 2020 · The marginal mandibular branch (MMBr) of the facial nerve is the least likely to recover from injury due to infrequent anastomosis with other branches. Of the five major branches of the facial nerve, the marginal mandibular branch of the facial nerve supplies muscles of the lower lip. Identification and preservation of the marginal mandibular nerve remains a critical step in otolaryngologic, cosmetic and oncologic head and neck surgery. japa tnjixxo avlj zrar bjse hreabxec dltoqkl kjht cvun wetl
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