| 1
.
| Posterior ethmoidal foramen |
| 2
.
| Ethmoidal cells (posterior) |
| 3
.
| Sphenoid sinus left |
| 4
.
| Line of attachment of superior nasal concha |
| 5
.
| Superior nasal meatus |
| 6
.
| Sphenopalatine foramen |
| 7
.
| Upper pointer: Line of attachment of middle nasal concha Lower pointer: Middle nasal meatus |
| 8
.
| Maxillary sinus |
| 9
.
| Ethmoidal process inferior nasal conchae |
| 10
.
| Medial plate of pterygoid process |
| 11
.
| Perpendicular part palatine bone |
| 12
.
| Palatomaxillary suture |
| 13
.
| Upper pointer: Position of greater palatine foramen Lower pointer: Horizontal plate palatine bone |
| 14
.
| Upper pointer: Orbital part of frontal bone Lower pointer: Anterior ethmoidal foramen |
| 15
.
| Frontal sinus |
| 16
.
| Ethmoidal cells (anterior) |
| 17
.
| Opening of frontonasal duct into frontal recess of middle nasal meatus |
| 18
.
| Hiatus semilunaris |
| 19
.
| Ethmoidal bulla |
| 20
.
| Ethmoidal infundibulum |
| 21
.
| Uncinate process ethmoid bone |
| 22
.
| Lacrimal bone |
| 23
.
| Lacrimal process inferior nasal conchae |
| 24
.
| Nasal opening of nasolacrimal canal visible through window cut in inferior concha) |
| 25
.
| Inferior nasal meatus |
| 26
.
| Palatine process of maxilla |
