The nasal process of the frontal bone is thick and forms a "beak" that restricts both the anterior access to and drainage of the frontal sinus (Fig. 14.26a, b). The frontal intersinus septum varies greatly in its position. The extent and direction of pneumatization vary more than in any other area of the paranasal sinuses. The frontal sinus often has more than one drainage channel. Pneumatized cells can travel up into the frontal bone in all directions; anteriorly these form high agger
nasi air cells, otherwise known as bulla frontalis, whereas if they extend above the septum they are called intersinus septal cells, and behind the frontal recess they form supraorbital cells (Fig. 14.27a, b).
The main concern in this procedure is the cribriform plate that is positioned behind the coronal plane that connects the frontal recesses. Laterally lie the lamina papyracea of the ethmoid bone, the anterior ethmoid air cells, and part of the orbital component of the frontal bone. Not infrequently the me
dian drainage procedure is indicated because the lateral support has been removed in an external procedure, allowing collapse of the orbital contents medially (Fig. 14.28). The anterior boundary of the frontal recess is made of very thick bone, but this is a safe area to operate in as it is away from both the cribriform plate and the anterior ethmoid artery (Sim-men, 1997).
Was this article helpful?
The human body And Todays chemical infested world. Here is a news flash You are not allergic to pollen, pet dander, or whatever it is that makes your body revolt Rather, your body just can not handle that one thing, what ever it is, anymore, due to the massive barrage of toxic chemicals you and everyone else are ingesting every single day.