<prompt> All of the following structures pierce the buccinator muscle except -Parotid ductMolar glands of the cheekBuccal branch of facial nerveBuccal branch of the mandibular nerve  <response>: Structures piercing the buccinator are :-Parotid ductBuccal branch of mandibular nerveFour or five molor mucous glands lying on the bucco-pharyngeal fascia around the parotid duct. 