Lymph nodes located under arms.

Lymph nodes above the collarbone.

Lymph nodes near front neck.

Glands in neck, filter pathogens.

The retropharyngeal lymph nodes, from one to three in number, lie in the buccopharyngeal fascia, behind the upper part of the pharynx and in front of the arch of the atlas, being separated, however, from the latter by the longus capitis.

The submandibular lymph nodes (submaxillary glands in older texts), are some 3-6 lymph nodes situated at the inferior border of the ramus of mandible.

The submental lymph nodes (or suprahyoid lymph nodes) are 2-3 lymph nodes situated in the submental triangle, between the anterior bellies of the digastric muscle and the hyoid bone.

Enlarged nodes due to inflammation.