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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.

IMPORTANCE:

   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.

STRUCTURE:

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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