No one can catch a sinus infection from another person, but the viruses and bacteria that cause colds and other respiratory tract * infections that can trigger sinusitis may spread from person to person in drops of fluid from the nose or mouth.
We call the major salivary glands the parotid, submandibular, and sublingual glands. They all secrete saliva into your mouth, the parotid through tubes that drain saliva, called salivary ducts, near your upper teeth, submandibular under your tongue, and the sublingual through many ducts in the floor of your mouth.
Salivary glands produce saliva, which moistens the mouth to help a person chew and swallow food. Saliva also contains substances (enzymes) that begin the breakdown of food.There are four pairs of salivary glands: 1  The parotid glands are located between the ear and the jaw. The submandibular glands are located under the jaw. 2  The sublingual glands are located on the floor of the mouth under the tongue. 3  The buccal glands are not shown in this picture. 4  They are located in the mucous membrane lining the cheeks and mouth. 5  These glands produce only a small amount of saliva.