Facial paralysis can lead to dysfunctions in eyelid closure, which is called lagophthalmos. A number of surgical procedures, both dynamic and static, have been described to restore the innervation of the orbicularis oculi muscle that closes the eyelids. This cadaver-based anatomical study aimed to evaluate the anatomy of the anterior, middle, and posterior deep temporal nerves; nerves to the temporalis muscle; and their availability for direct muscle neurotization of the orbicularis oculi. A total of 10 hemisectioned head specimens from 5 adult cadavers (2 men and 3 women) were used in this study. The adequacy of the length of the anterior deep temporal nerve was assessed for direct neorotization of the orbicularis oculi muscle. The mean distances between the originating point of the deep temporal nerves from the mandibular nerve in the infratemporal fossa and their terminal entry points into the muscle were 46.4 (42-51 mm), 42.2 (38-46 mm), and 33.4 mm (26-40 mm) for the anterior, middle and posterior branches of the nerves, respectively. We conclude that the anterior deep temporal nerve is a versatile nerve that can be used for direct muscle neurotization, nerve transfer, and babysitter procedures in selective blinking restoration. Before proceeding with any further clinical use, an anatomical study should be performed with fresh specimens from cadavers.
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