For example, the cartilaginous plate separating the cavum principale from the cavum medium is termed the lamina superior.

The fusion of the two recesses of the cavum inferior completely separates the lamina inferior from the solum nasi (Fig. 6).

In the region of the internal nares, the nasal forms the lateral wall of the cavum principale (Fig. 12).

The medial branch terminates posteriorly at the level at which the cavum principale joins the cavum inferior.