human`s head with three main paired salivary glands: parotid, submandibular, and sublingual

anatomical anatomy biology body buccal cancer care diagnosis digestion digestive disease duct ducts exocrine gland glands head healthcare healthy human humans illness illustration jaw lateral main mouth mumps oral organ pain paired parotid poster produce saliva salivary science sialolithiasis structure sublingual submandibular surgery system that three throat tongue treatment vector woman