Anatomical Features in Lower-Lip Depressor Muscles for Optimization of Myectomies in Marginal Mandibular Nerve Palsy

Introduction: Myectomies of the lower-lip depressor muscles, with aim to improve facial balance in unilateral paralysis, have unexplained high recurrence rates. A potential explanation is that these recurrences are due inadequate resection through muscle width, leaving lateral fibers intact. Aim: Revisit anatomy muscles and suggest an optimization surgical technique. Perform a literature review identify rates technique procedure. Materials Methods: Ten fresh hemifaces were dissected. The following measurements labii inferioris anguli oris made: widths distance from mandibular midline borders intraoral canine border oris. was performed. Results: width 20 ± 4 mm 14 3 mm. 32 54 for revealed mean rate 21%. Discussion: myectomies extend laterally. To ensure inclusion whole decrease procedure, presented this study should be kept mind during surgery.