Fig. 1. The location of the emerging point of the BB is sporadically distributed throughout the anterior border of the PG. Then, it branched and arranged into the ZBP in masseteric and buccal regions, and presented the medial line of the ZBP branched into small twigs to innervate muscles around the mouth and nose. BB, buccal branch; ZBP, zygomatico-buccal plexus; TB, temporal branch; ZB, zygomatic branch; BB1, first buccal branch; BB2, second buccal branch; BB3, third buccal branch; MMB, marginal mandibular branch; CB, cervical branch; AN, angular nerve; PG, parotid gland; PD, parotid duct; MM, masseter muscle; LLS, levator labii superioris muscle; OO, orbicularis oculi muscle; OOr, orbicularis oris muscle; DAO, depressor anguli oris muscle; red arrowhead, the medial line of the ZBP; yellow arrowhead, small twigs of the BB; blue arrow, ZB gave branch to connect the BB; FHL, Frankfort’s horizontal line; midFHL, midpoint of the FHL; ATL, anterior tragal line; red circle, emerging point of the BB.
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