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What is the purposes of sinuses11/14/2022 ![]() ![]() ![]() It may be difficult to define when air cells marginate the ostium ( Fig 8). The frontal ostium extends between the anterior and posterior walls of the frontal sinus, is demarcated by a variably shaped ridge of bone on the anterior wall of the sinus, and is oriented nearly perpendicular to the posterior wall of the sinus. Each frontal sinus narrows down to an inferior margin designated the frontal ostium ( Figs 1 and 3D-F′). The frontal sinus has the most complex and variable drainage of any paranasal sinus. Herein one coherent set of names for the structures of the FSDP is used that specifically excludes the term “frontal recess” because that term is difficult to define anatomically ( 6).įigure 1 provides an overview of the drainage pathways of the paranasal sinuses that are based upon the skull illustrated in Figures 3 and 4. For these reasons, and because anatomic variations are frequent, the exact terminology employed to designate paranasal air spaces may be subjective. Both cribriform and ethmoid mean “sievelike,” and both bulla and agger signify a “projecting anatomic structure,” but convention has limited usage of each term to specific structures. Now an osseous recess is an air space with more than one drainage ostium (as distinct from an osseous air cell, which has only one drainage ostium), whereas the terms maxillary sinus and maxillary antrum may be used interchangeably. Originally, the terms sinus, antrum, and recess all referred to a cavity, then a cavity within a bone. Sinus nomenclature may be both redundant and confusing ( 10, 11). Suggested readings provide more detailed descriptions of paranasal sinus anatomy and terminology for further study ( 1– 9). The purpose of this pictorial essay is to provide a visual guide to the frontal sinus drainage pathway (FSDP), associated anatomic structures, and normal variations in sinus anatomy ( Figs 1– 9). ![]()
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