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| Uncinate process of ethmoid bone | |
|---|---|
 Lateral wall of nasal cavity, showing ethmoid bone in position.(Uncinate process of ethmoid labeled at left.) | |
 Ethmoid bone from the right side. (Uncinate process labeled at bottom right.) | |
| Details | |
| Identifiers | |
| Latin | processus uncinatus ossis ethmoidalis |
| TA98 | A02.1.07.016 |
| TA2 | 737 |
| FMA | 57455 |
| Anatomical terms of bone | |
In the ethmoid bone, a sickle shaped projection, the uncinate process, projects posteroinferiorly from the ethmoid labyrinth. Between the posterior edge of this process and the anterior surface of the ethmoid bulla, there is a two-dimensional space, resembling a crescent shape. This space continues laterally as a three-dimensional slit-like space - the ethmoidal infundibulum. This is bounded by the uncinate process, medially, the orbital lamina of ethmoid bone (lamina papyracea), laterally, and the ethmoidal bulla, posterosuperiorly. This concept is easier to understand if one imagine the infundibulum as a prism so that its medial face is the hiatus semilunaris. The "lateral face" of this infundibulum contains the ostium of the maxillary sinus, which, therefore, opens into the infundibulum.