submandibular lymph nodes
The submandibular lymph nodes sit between the salivary gland and the mandible. Occasionally one or more of the lymph nodes may be embedded deep within the salivary gland. The nodes are small, usually measuring approximately 1 centimeter in a healthy adult. The submandibular duct is around 5 centimeters long in an adult. The wall of the duct is thin and flexible. As the duct runs forward, it passes between the sublingual gland and genioglossus to create an opening in the floor of the mouth. As the duct traverses the deepest part of the gland, it connects with tributaries draining into the lobe. The arterial blood supply arises from multiple parts of the facial and lingual arteries. Venous blood drains into the deep lingual vein. The lymphatics then drain into a group of nodes via the submandibular lymph nodes. Swollen submandibular nodes usually indicate an active viral or bacterial infection and are commonly associated with infections of the sinuses, eyes, and ears.
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In Depth: submandibular lymph nodes