The main excretory tubular canal that connects the parotid gland and the buccal mucosa and secretes a serous saliva into the vestibule of the oral cavity; it arises from the anterior surface of the gland, traversing the masseter muscle; the duct then pierces the buccinator muscle, moving medially, and opens out into the oral cavity near the second upper molar; saliva produced by acinar secretory cells in the glandular body flows sequentially through the intercalated ducts, striated ducts, and excretory ducts. [ ]