WHAT IS OSTEOMEATAL COMPLEX?
A micro architectural drainage pathway for anterior group of major paranasal sinuses & consists of a narrow cleft of ethmoidal infundibulum between the uncinate process & bulla ethmoidalis.
COMPRISES: 1) Ostium of maxillary sinus, 2) Frontal recess.
Anatomical & pathological abnormalities in this region lead to persistent infection & disease within the major sinus.
MIDDLE MEATUS OF NOSE: Most complex meatus lying deep to the middle concha.
1) ATRIUM: Forward continuation of meatus.
2) AGGER NASI: Curved ridge above the atrium. Get pneumatised from ethmoid & known as “Agger Nasi air cell”.
3) UNCINATE PROCESS: A small thin plate of bone covered by mucoperiosteum, attached to lamina propria superiorly & to inferior choncha inferiorly just beneath the attachment of middle turbinate.
4) BULLA ETHMOIDALIS: A round prominence postero superior to uncinate process represents middle from post- ethmoidal cells by basal lamina.
5) HIATUS SEMILUNARIS: Between uncinate process & bulla ethmoidalis, a laterally & middle turbinate medially.
6) INFUNDIBULUM: A narrow three dimensional space between uncinate process & bulla ethmoidalis a laterally & middle turbinate medially.
7) OPENINGS: A) Frontal Sinus- Into the infundibulum through the frontal recess or through the anterior ethmoidal ethmoidal air cells. B) Anterior & middle Ethmoidal air cells- on thye surface of bullae.
8) NATURAL OSTEUM OF MAXILLARY SINUS: Into the hiatus.
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