|- style="text-align: center; line-height: 1;" class="hiddenStructure"
| colspan="2" |
|- class="hiddenStructure"
|Latin
|colspan="2"|
|- class="hiddenStructure"
|
|colspan="2"|[subject #33 ]
|- class="hiddenStructure"
|System
|colspan="2"|
|- class="hiddenStructure"
|Precursor
|colspan="2"|
|- class="hiddenStructure"
|MeSH
|colspan="2"|[]
|- class="hiddenStructure"
|Dorlands/Elsevier
|colspan="2"|[d_29/12314080]
|}
The frontal air sinuses are lined by mucous membrane, and each communicates with the corresponding nasal cavity by means of a passage called the frontonasal duct.
