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Key words: extraction, maxillary sinus, panoramic radiograph, pneumatization, sinus floor topography. Pneumatization is a physiologic process that. occurs in all paranasal sinuses during the growth. period, causing them to increase in volume.1,2 The. maxillary sinus is the largest of the paranasal sinuses.
The pneumotaxic center, also known as the pontine respiratory group (PRG), is a network of neurons in the rostral dorsal lateral pons.It consists of the Koelliker-KÃ¶lliker fuse nucleus and the medial parabrachial. Nucleus it is considered an antagonist to the apneustic, center which produces abnormal breathing during. inhalationespiratory effects [edit]. The PRG antagonizes the apneustic center, cyclically inhibiting inhalation. The PRG limits the burst of action potentials in the phrenic nerve, effectively decreasing the tidal volume and regulating the respiratory rate.