On the lateral wall of the middle meatus is a curved fissure, the hiatus semilunaris, limited below by the edge of the uncinate process of the<unk>  and above by an elevation named the<unk> <unk> alis; the middle<unk> al cells are contained within this<unk>  and open on or near to it.
The<unk> <unk> alis is caused by the bulging of the middle<unk> al cells which open on or immediately above it, and the size of the<unk>  varies with that of its contained cells.
Ethmoid bulla
Mastoid process
Pharyngeal recess
Dental alveolus
Veratrum
Arytenoid cartilage
Cauliflower ear
Zygomatico-orbital foramina