2. Anatomy The lateral wall of nose: Maxillary bone Ethmoid bone
Esphenoid bone
Inferior turbinate
Lacrimal bone
Palatine bone

3. Turbinates

4. Lamella

5. Uncinate process

6. Uncinate process

8. Ostiomeatal complex : OMC
Anterior ethmoid middle meatus complex
Bulla ethmoidalis
Lamina papyracea
Uncinate process
Fovea ethmoidalis
Basal lamella

9. Ostiomeatal complex : OMC
Suprabullar recess
Frontal ostium
Lateral sinus Frontal recess
Retrobullar recess HSS
HSI
Maxillary ostium Infundibulum

10. Ostiomeatal complex : OMC
Bulla ethmoidalis
Hiatus semilunaris inferior
Infundibulum
Frontal recess & Frontal ostium
Maxillary ostium

11. Ostiomeatal complex : OMC
Bulla ethmoidalis
Hiatus semilunaris superior
Lateral sinus
Retro-bullar recess
Supra-bullar recess

13. Maxillary ostium

14. Frontal recess A B

15. Cell No. 1 is the agger nasi cell as it is seen anterior to the middle turbinate (A). It can be seen on the parasagittal scan, just behind the frontal process of the maxilla. Cell No. 2 is the K3 cell as it can be seen above the floor of the frontal sinus (the continuous bone just below No. 2) as it has pneumatized through the frontal ostium into the frontal sinus. Cell No. 3 is the ISSC as it is associated with the frontal sinus septum. Seen only on the parasagittal scan, cell Nos. 4 and 5 represent the supra-bulla cell and bulla ethmoidalis, respectively

17. Landmarks in FESS The four lamellae Uncinate process Bulla ethmoidalis
Basal lamella
Sphenoid sinus

18. Skull base: anterior ethmoids & AEA
Crista galli
Septum
Cribriform plate
Middle turbinate
Lateral lamella
Fovea ethmoidalis

19. Middle turbinate, basal lamella
Part Site Direction Attachment
1st part (anterior) Vertical Skull base
2nd part (middle) Oblique Lamina papyracea
3rd part (posterior) Transverse Perpendicular plate of palatine bone

20. Middle turbinate, basal lamella

23. Basal lamella and ethmoids
Anterior ethmoids
Posterior ethmoids

24. Sphenoid sinus
Optic nerve
Carotid artery
Sella tursica
Maxillary nerve
Vidian nerve

28. II- Boundaries ‘Limits’
Orbit
Lamina papyracea
Cranial cavity
Fovea ethmoidalis
Cribriform plate
Sphenoid