<prompt> Nasolacrimal duct opens into:Superior meatusMiddle meatusInferior meatusSphenoethmoidal recess  <response>: Ans. c Inferior meatus. Ref Bhargav, ENT, 5th ed., pg 51THE LATERAL WALL OF NOSE Consists anteriorly of the nasal bone, frontal process of maxilla the lacrimal bone. Posterior to lacrimal bone, the lateral wall of nasal cavity is formed by ethmoid labyrinth, maxillary inferior concha. The most posterior portion is formed by perpendicular plate of palatine bone the medial pterygoid plate. Superior middle conchae are part of ethmoid bone, but the inferior conchae are separate pair of bones.AREA IN NOSECONTENTSSuperior turbinate-meatus1. Post ethmoidal air cells drain into it 2. Sphenoid sinus drain via sphenoethmoidal recess.Middle turbinate meatusMost important area, forms OMC where following drain into it: Q1. Anterior ethmoid air cells,2. Maxillary 3. Frontal sinuses.Inferior turbinate meatusLargest turbinate.1. Nasolacrimal duct drains into its anterior part.0Frontal recessFrontal sinuses communicate the medial meatus of ipsilateral half of nasal cavity by means of a passage called frontonasal canalfrontal recess.Anterior to frontal recess anterior end of middle turbinate is the bony prominence of frontal process of maxilla known as Agger nasi, cells in it drain into ethmoid infundibulum.Osteomeatal unit complex OMC confluenceUncinate process is thin, curved lamina of bone from the lateral side of ethmoidal labyrinth that forms a portion of lateral nasal wall.Ethmoidal infundibulum is a trough shaped air space that is below bulla above lateral to uncinate process. It receives drain from anterior middle ethmoid air cells frontal maxillary sinuses. The infundibulum may be narrowed if there is Concha bullosa0 pneumatized middle turbinate or large Hallers cell anterior eth air cells present at the roof of Maxillary antrum.Hiatus semilunaris0 is curvilinear opening of lateral wall that is above uncinate process below the bulla ethmoidalis. It separates uncinate process from ethmoidal bulla serves as connection between infundibulum middle meatus.The middle ethmoidal air cell produces a round swelling called bulla ethmoidalis on lateral wall of middle meatus.Onodi cells are most posterior ethmoidal cells that surround optic canal. 0 