Ethmoidal_infundibulum

Ethmoidal infundibulum

Ethmoidal infundibulum

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The ethmoidal infundibulum is a funnel-shaped[1]/slit-like[2]: 690 /curved[3] opening[1]/passage[4]/space[2]: 690 /cleft[3] upon the anterosuperior portion of the middle nasal meatus[1] (and thus of the lateral wall of[2] the nasal cavity[1]) at the hiatus semilunaris[3][5] (which represents the medial extremity of the infundibulum[2]). The anterior ethmoidal air cells,[4][2]: 612  and (usually[2]: 612, 690 ) the frontonasal duct (which drains the frontal sinus[1][4])[1][4][2]: 690  open into the ethmoidal infundibulum.[1] The ethmoidal infundibulum extends anterosuperiorly from its opening into the nasal cavity.[3][2]: 612 

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Anatomy

The ethmoidal infundibulum is bordered medially by the uncinate process of the ethmoid bone, and laterally by the orbital plate of the ethmoid bone.[3]

The ethmoid infundibulum leads towards the maxillary hiatus.[2]: 690 The anterior ethmoidal cells open into the anterior part of the infundibulum.[6]

Variation

The frontonasal duct may or may not drain into the ethmoidal infundibulum - this is determined by the place of attachment of the uncinate process of the ethmoid bone: if the uncinate process is attached to the lateral nasal wall, the frontonasal duct will open directly into the middle nasal meatus; if otherwise, it will drain into the infundibulum.[2]: 690  In slightly over 50% of subjects, it is directly continuous with the frontonasal duct. When the anterior end of the uncinate process fuses with the anterior part of the bulla, however, this continuity is interrupted and the frontonasal duct then drains directly into the anterior end of the middle meatus.[6]

References

  1. [1]
    Moore, Keith L.; Dalley, Arthur F.; Agur, Anne M. R. (2017). Essential Clinical Anatomy (6th ed.). Lippincott Williams & Wilkins. pp. 966–967. ISBN 978-1496347213.
  2. [2]
    Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42nd ed.). New York. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  3. [3]
    Sinnatamby, Chummy S. (2011). Last's Anatomy (12th ed.). Elsevier Australia. p. 374. ISBN 978-0-7295-3752-0.
  4. [4]
    "infundibulum ethmoidale". TheFreeDictionary.com. Retrieved 2023-07-02.
  5. [5]
    Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 683. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  6. [6]
    Gray, Henry (1918). Gray's Anatomy (20th ed.). p. 995.


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