Buccinator is pierced by all of the following except:
(A) Labial branch of facial nerve (B) Buccal branch of mandibular nerve (C) Parotid duct (D) Molar mucous glands
(B) Ans: B. Buccal branch of mandibular nerve(Ref Grays 41/e 4(Y 10/e p487; Snells 9/e p582)Buccal branch of facial run crosses the buccinator muscle and innervates it, without piercing it.Buccinator - Structures passing:Anteriorly (Superficial buccinator surface):Muscles - zygomaticus major, risorius, levator & depressor anguli oris muscles.Duct - Parotid duct.Pierces buccinator opposite third upper molar tooth & lies on deep muscle surface before opening into mouth opposite maxillary second molar tooth.Blood vessel - Crossed by facial aery, facial vein & branches of facial & buccal nerves.