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<p><b>New page</b></p><div>[[file:Gray602.png|thumb|left]] {{Short description|Lymph nodes located in the mastoid region of the skull}}<br />
{{Infobox anatomy<br />
| Name = Mastoid lymph nodes<br />
| Latin = nodi lymphoidei mastoidei<br />
| Image = <br />
| Caption = <br />
| Drainsto = [[Deep cervical lymph nodes]]<br />
| Source = <br />
| System = [[Lymphatic system]]<br />
| Precursor = <br />
| Partof = <br />
| Artery = <br />
| Vein = <br />
| Nerve = <br />
| Lymph = <br />
| MeshName = <br />
| MeshNumber = <br />
}}<br />
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The '''mastoid lymph nodes''' (also known as the '''posterior auricular lymph nodes''') are a group of [[lymph nodes]] located in the [[mastoid process]] region of the [[temporal bone]] of the [[skull]]. These lymph nodes are part of the [[lymphatic system]] and play a crucial role in the body's [[immune system]] by filtering lymphatic fluid and trapping pathogens.<br />
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==Anatomy==<br />
The mastoid lymph nodes are situated behind the [[ear]], near the [[mastoid process]] of the [[temporal bone]]. They are typically small and can vary in number. These lymph nodes receive lymphatic drainage from the [[posterior part of the scalp]], the [[auricle]] (external part of the ear), and the [[external auditory canal]].<br />
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==Function==<br />
The primary function of the mastoid lymph nodes is to filter lymphatic fluid, which contains [[white blood cells]], [[cellular debris]], and [[pathogens]]. By trapping and destroying harmful substances, these lymph nodes help to prevent infections and maintain overall health.<br />
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==Clinical significance==<br />
Enlargement of the mastoid lymph nodes can occur due to various conditions, including [[infections]], [[inflammation]], and [[malignancies]]. Common causes of lymph node enlargement in this region include [[otitis externa]], [[otitis media]], and [[mastoiditis]]. In some cases, the enlargement may be a sign of more serious conditions such as [[lymphoma]] or [[metastatic cancer]].<br />
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==Related structures==<br />
The mastoid lymph nodes are part of a larger network of lymph nodes in the head and neck region, including the [[preauricular lymph nodes]], [[submandibular lymph nodes]], and [[deep cervical lymph nodes]]. These nodes work together to filter lymphatic fluid from different parts of the head and neck.<br />
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==See also==<br />
* [[Lymphatic system]]<br />
* [[Lymph node]]<br />
* [[Mastoid process]]<br />
* [[Temporal bone]]<br />
* [[Immune system]]<br />
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==References==<br />
{{Reflist}}<br />
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[[Category:Lymphatic system]]<br />
[[Category:Head and neck]]<br />
[[Category:Anatomy]]<br />
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