| a | maxillary antrum |
| b | orbit |
| c | sphenoid sinus |
| d | hard palate |
| e | anterior walls of zygomatic recesses |
| f | superimposed wall of zygomatic recesses |
| g | lateral orbital walls |
| h | orbital roofs |
| i | planum sphenoidale |
| j | posterior wall, antrum |
| k | anterior cortex pterygoid bone |