ethmoid bulla

{{Short description|Elevation on the lateral wall of the middle meatus of the nose}}

{{Infobox anatomy

| Name = Ethmoid bulla

| Image =

| Caption =

|Latin=bulla ethmoidalis}}

The ethmoid bulla (or ethmoidal bulla) is a rounded elevation upon the lateral wall of the middle nasal meatus{{Rp|page=377}} (nasal cavity inferior to the middle nasal concha) produced by one or more of the underlying middle ethmoidal air cells (which open into the nasal cavity upon or superior to the ethmoidal bulla{{Rp|page=374}}{{Cite book |last=Standring |first=Susan |url=https://www.worldcat.org/oclc/1201341621 |title=Gray's Anatomy: The Anatomical Basis of Clinical Practice |year=2020 |isbn=978-0-7020-7707-4 |edition=42th |location=New York |pages=612 |oclc=1201341621}}).{{Cite book |last=Sinnatamby |first=Chummy S. |title=Last's Anatomy |publisher= Elsevier Australia|year=2011 |isbn=978-0-7295-3752-0 |edition=12th |pages=}}{{Rp|page=377}} It varies significantly based on the size of the underlying air cells.{{Cite book |last=Gray |first=Henry |url=https://archive.org/details/anatomyofhumanbo1918gray/page/995/mode/2up?view=theater |title=Gray's Anatomy |year=1918 |edition=20th |location=995 |pages=1139}}

Structure

The ethmoid bulla is formed by is the largest and least variable of the middle ethmoidal air cells. The size of the bulla varies with that of its contained cells. The bulla may be a pneumatised cell or a bony prominence found in middle meatus.{{Citation needed|date=June 2023}}

= Relations =

The hiatus semilunaris is situated (sources differ) inferior{{Cite book |last1=Gray |first1=Henry |title=Anatomy of the nose of the Human Body |last2=Lewis |first2=Warren H. |year=1918 |pages=195 |edition=20th }}{{cite book |last1=Moore |first1=Keith L. |title=Essential Clinical Anatomy |last2=Dalley |first2=Arthur F. |last3=Agur |first3=Anne M. R. |publisher=Lippincott Williams & Wilkins |year=2017 |isbn=978-1496347213 |pages=967}}/anterior{{Rp|page=374}} to the ethmoid bulla. The maxillary sinus also opens below the bulla.{{Cite journal|last1=Wang|first1=Rong-Guang|last2=Jiang|first2=Si-Chang|date=1997-01-01|title=The Embryonic Development of the Human Ethmoid Labyrinth from 8-40 Weeks|url=https://doi.org/10.3109/00016489709118002|journal=Acta Oto-Laryngologica|volume=117|issue=1|pages=118–122|doi=10.3109/00016489709118002|pmid=9039492 |issn=0001-6489|url-access=subscription}}

= Development =

The ethmoid bulla begins to develop between 8 weeks and 12 weeks of gestation.

References

Category:Nose

Category:Otorhinolaryngology