YOGA AND SINUSITIS Dr. P.B. Rajput. There are about a dozen air sinuses in the human skull. Most of these are so placed that they drain out in the nasal cavity by gravity only. The large maxillary sinus has disadvantage; its ostium is small and is placed in such a place that any defect in nasal cavity (e.g. defects in mucosal lining, middle turbinate or nasal septum) will lead to closure. Thus the maxillary sinus for its normal functioning requires two things (1) good ventilation and (2) good blood supply to maintain cilliary function. So it is that this maxillary sinus in return depends on healthily maintaining nasal cavity. Any defect in the nasal cavity, either due to deviated nasal septum, hypertrophy of middle turbinate or mucosal collection will lead to proper ventilation of the nasal cavity which in turn will lead to maxillary ostium. Repeatedly poor drainage will leas to change of ciliated epithelium pattern. Mucosal lining of nasal and paranasal sinuses are under the supreme control of the sphenopalatine ganglia, which in turn is a part of the parasympathetic (autonomous) system. Infection, allergy, tension and emotions are the important factors controlling Mucosa.