<prompt> Parotid duct pierces which muscle?BuccinatorLateral PterygoidMedial PterygoidRisorius  <response>: Ans. is a i.e., Buccinator Structures piercing the buccinator arei Parotid ductii Buccal branch of mandibular nerveiii Four or five mucous glands lying on the bucco-pharyngeal fascia around the parotid duct. 