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This Concept Map, created with IHMC CmapTools, has information related to: Sinuses, Paranasal Sinuses Anatomy Osteomeatal Complex Superior Turbinate Sup. Meatus -drains post. eth cells, sphen Middle Turbinate Middle Meatus - hiatus semilunaris opens into infundibulum (air space) -drains frontal, max, ant eth Inferior Turbinate Inferior Meatus - drains lacrimal duct, Paranasal Sinuses Anatomy Septum Superiorly - Perpendicular Plate of Ethmoid bone Ant - Septal Cartilage Inf-maxilla (Nasal crest, ant nasal spine), palatine (nasal crest) Post - Vomer, Sphenoid bone (Crest), Paranasal Sinuses Embryology At birth: Ethmoid- 3-4 cells -at birth, begins to pneumatize Adult-10-15 cells, 2-3cc total Maxillary-small air cell 6-8yo Frontal sinus -4-7cc by 12-20yo Adolescence - complete, Paranasal Sinuses Vasculature Sphenopalatine Artery -enters through SP foramen -posterior to middle turb, Paranasal Sinuses Ethmoid Drainage -Anterior-to infudibulum -Post- to Sphenoethmoid recessl (sup meatus) Vasculature -ant, post ethmoid aa (from ophthalmic) -max and ethmoid vv -> cavernous sinus Innervation -ant, post ethmoidal nn (CN V1) Aggar Nasi-anterior-most cell -may need to enter to reach frontal recess Ground (Basal) Lamella -separates ant from post cells Onodi cells-ethmoid cells into sphenoid -may contain optic n or carotid aa Haller cells-ethmoid into maxillary Fovea ethmoidalis-roof of ethmoids, Paranasal Sinuses Sphenoid Evagination of nasal mucosa into sphenoid bone Volume 0.5-8cc Drains to sphenoethmoid recess Vasc-SPA (from maxillary a) -Maxillary v. (pterygoid plexus) Innerv-SP nerve - CN V2 Ostium- 1. adjacent to post border of septum 2. 6-8cm post of ant nasal spine 3. 30deg from floor of nose 4. 1.5cm above choanal floor 5. 1/3 up from choana to skull base