• Source: Ethmoidal infundibulum

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




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




= Variation

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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.: 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.




References






External links


Atlas image: rsa2p6 at the University of Michigan Health System

Kata Kunci Pencarian:

• Ethmoidal infundibulum
• Infundibulum
• Ethmoid sinus
• Semilunar hiatus
• Uncinate process of ethmoid bone
• Ethmoidal labyrinth
• Frontonasal duct
• Maxillary hiatus
• Nasal meatus
• Dura mater