It is the thinnest wall of the orbit, evidenced by pneumatized ethmoidal cells.
2.
The anterior ethmoidal cells of the ethmoidal sinus open into the front part of the infundibulum as well.
3.
More rarely it opens on both surfaces, and then communicates with the posterior ethmoidal cells and the sphenoidal sinus.
4.
In some cases the air cell opens on this surface of the bone and then communicates with the posterior ethmoidal cells.
5.
In 90 % of patients an anterior ethmoidal cell ( called the " agger nasi cell " ) can be found in the lacrimal bone below the agger nasi ridge.
6.
The area in front of this furrow forms part of the middle meatus of the nose; that behind it articulates with the ethmoid, and completes some of the anterior ethmoidal cells.
7.
The bulla ethmoidalis is caused by the bulging of the middle ethmoidal cells which open on or immediately above it, and the size of the bulla varies with that of its contained cells.
8.
It consists of a thin infundibulum, extends upward and forward through the labyrinth and communicates with the anterior ethmoidal cells, and in about 50 % of skulls is continued upward as the frontonasal duct into the frontal sinus.
9.
On it is a curved fissure, the hiatus semilunaris, limited below by the edge of the uncinate process of the ethmoid and above by an elevation named the bulla ethmoidalis; the middle ethmoidal cells are contained within this bulla and open on or near to it.
10.
The lateral margin of the anterior surface is serrated, and articulates with the lamina papyracea of the ethmoid, completing the posterior ethmoidal cells; the lower margin articulates with the orbital process of the palatine bone, and the upper with the orbital plate of the frontal bone.
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