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The preauricular deep parotid lymph nodes (anterior auricular glands or preauricular glands), from one to three in number, lie immediately in front of the tragus. Their afferents drain multiple surfaces, most of which are lateral in origin.
Parotid lymph nodes are lymph nodes found near the parotid gland in the immune system. More specifically, it can refer to: deep parotid lymph nodes;
The deep parotid lymph nodes are lymph nodes found below the parotid gland. The afferents of the subparotid glands drain the nasal part of the pharynx and the posterior parts of the nasal cavities. Their efferents pass to the superior deep cervical glands .
Involvement of the cervical lymph nodes with metastatic cancer is the single most important prognostic factor in head and neck squamous cell carcinoma and may be associated with a halving of survival. Where the cancer has penetrated the capsule of the lymph gland (extracapsular extension) survival may be decreased by a further 50%.
The occipital lymph nodes, one to three in number, are located on the back of the head close to the margin of the trapezius and resting on the insertion of the semispinalis capitis. Their afferent vessels drain the occipital region of the scalp , while their efferents pass to the superior deep cervical glands .
The superficial parotid lymph nodes are a group of lymph nodes anterior to the ear. Their afferent vessels drain the root of the nose , the eyelids , the frontotemporal region, the external acoustic meatus and the tympanic cavity , possibly also the posterior parts of the palate and the floor of the nasal cavity .
The mastoid lymph nodes (retroauricular lymph nodes or posterior auricular glands) are a small group of lymph nodes, usually two in number, located just beneath the ear, on the mastoid insertion of the sternocleidomastoideus muscle, beneath the posterior auricular muscle.
The lymphatic system drains the head and neck of excess interstitial fluid via lymph vessels or capillaries, equally into the right lymphatic duct and the thoracic duct. Lymph nodes line the cervical spine and neck regions as well as along the face and jaw. The tonsils also are lymphatic tissue and help mediate the ingestion of pathogens.