Depth of the facial nerve in face lift dissections.

Facial nerve depth was measured in 12 cadaver face halves after bilateral face lift dissections. The main nerve trunk emerged anterior to the midearlobe and was 20.1 +/- 3.1 mm deep. Nerve exit from the parotid edge also was deep, averaging 9.1 +/- 2.8 mm for temporal, 9.2 +/- 2.2 mm for zygomatic, 9.6 +/- 2.0 mm for buccal, and 10.6 +/- 2.7 mm for mandibular branches. Distal to the parotid gland, danger areas where nerve branches became superficial were distal temporal, lower buccal, and upper mandibular branches over the masseter muscle and marginal mandibular as it crossed the facial artery. Some protection in these danger areas was provided by fascia, especially superficial temporal and masseteric, while platysma provided some protection for the mandibular branch. Fascial and muscle protection was less in thin cadavers. Face lift dissection can be rapid in areas where facial nerve branches are deep or absent, such as postauricular, inferior to the zygomatic prominence, and near the earlobe.