Fig. 2.12a-c. The coronal planes through anterior ethmoid sinus show the different components of the OMU. a The maxillary sinus ostium (O) communicates with the ethmoid infundibulum (arrowheads on right side). Ethmoid bulla (B) and uncinate process (UP) border the infundibulum. The air space between the bulla and the horizontal portion of the uncinate process is part of the hiatus semilunaris (H). Frontal recess (FR), ethmoid infundibulum and a more posterior opening of the bulla, small arrows on (b) and (c) open into the middle meatus (asterisks). b The air space between the attachment of middle turbinate onto the lamina papyracea (ground lamella, GL) and the posterior surface of the bulla is the sinus lateralis (SL). Pneumatized vertical lamella of the middle turbinate (vlMT), superior turbinate (ST), anterior canal of the ethmoid (aEC)
nate process (Fig. 2.6). The ethmoidal infundibulum is closed anteriorly by the vertical insertion of the uncinate process at the medial maxillary wall, generally forming a sharp angle onto the nasolacrimal duct bony wall (Fig. 2.5). Laterally, the upper portion of the ethmoidal infundibulum is bordered by the lamina papyracea, posteriorly by the ethmoidal bulla. The infundibulum may directly communicate with or be totally separated from the frontal recess depending on the configuration of the uncinate process (see Sect. 2.1.3).
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