Danger zones for temporal, marginal mandibular, buccal, and zygomatic branches of the facial nerve. Danger zones for the great auricular and the spinal accessory nerves, and the parotid gland.

Facial nerve danger zones. The frontal branch (F) of the facial nerve where it crosses the zygoma (area 4). The marginal mandibular (M) nerve where the superficial musculoaponeurotic system is thinned in the lower face (area 5). The parotid duct (PD) and the buccal (B) and zygomatic (Z) branches at the anterior border of the masseter muscle (area 6). The great auricular nerve (GAN) and the spinal accessory nerve (SAN) at Erb's point on the posterior margin of the sternocleidomastoid muscle (area 7). The parenchyma of the parotid gland (P) (area 8).