[two Principles in Construction and Reaction of the Paranasal Sinuses. from the Theory of "form and Power of the Lumen Organ"].

The author had reported two princiles in construction and reaction of the lumen organ (middle ear, paranasal sinuses, lung and salivary grand) in the foregoing reports. In this paper an atempted was made to find these principles in the paranasal sinuses. The first principle is as follows; The lumen organ consists of two forms, namely cell form and antrum form. And the organ in which the cell form is demonstrated markedly is recognized as well developed, on the contrary the organ in which the cell form is reduced and the antrum form is expressed makedly is recognized as underdeveloped. The well developed organ posesses the strong potentiality in reaction against stimuli and in its regeneration. This principle fits also to sinus and sinuitis. In chronic sinuitis the well developed sinuses revealed edematous hyperplasia and the underdeveloped sinuses fibrous change. The second principle is as follows; The lumen organ consists of canal part and chamber part, the latter consists of cell and chamber as mentioned above. In these two parts there exists the csrresponding relation in the developement of these parts. If the chamber part reduces its lumen size, the canal part becomes enlarged, on the contrary if the chamber part develops well, the canal part becomes atrophy. This principle also fits the sinus. The foramen and ductus of the sinuses are smaller in the large sinuses than the small one. Therefore the large sinuses reveal disposition to stenosis of the foramen or the ductus, resulting in prulent sinusitis or mucocoele.