L'anatomie humaine, y compris la structure et le développement et des considérations pratiques de l'ess . os palais palatale (évidement). Contraction de la sinus maxillaire, d'autre part, mayfollow : (i) de l'absorption imparfaite os cancellated sur le plancher du sinus, ou secondarythickening de ses murs ; (2) atteinte en raison de rapprochement des soins du visage et du nez sur les murs de la canine dépression inhabituel fossa, excès de renflement de la paroi nasale latérale, ou imperfectlyerupted les dents. Les projections en croissant qui très souvent sont vus qui dépasse de l'intérieur, à l'occasion les murs dansle ar

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Human anatomy, including structure and development and practical considerations . ess ofthe palate bone (palatal recess). Contraction of the maxillary sinus, on the other hand, mayfollow : (i) imperfect absorption of the cancellated bone on the floor of the sinus, or secondarythickening of its walls; (2) encroachment due to approximation of the facial and nasal walls, unusual depression of the canine fossa, excessive bulging of the lateral nasal wall, or imperfectlyerupted teeth. The crescentic projections which quite commonly are seen protruding from the walls intothe interior, occasionally are replaced by septa that completely divide tiie sinus into two cavities, each having its independent opening into the nasal fossa, but not being in communication with eachother. These partitions vary in position and direction, sometimes subdividing tiie antrum into ananterior and a posterior compartment, and at others, into an upper and a lower chamber. Inthe last case the lower space may communicate with the inferior meatus (Zuckerkandl, Briihl). Fig. 1185. Right frontal sinus. Left frontal sinus Passage leading intoinfundibulum andmiddle meatus Nasal septum Portion of frontal section exposing frontal sinuses which are asymmetrical. The Frontal Sinus.—The air-spaces between the outer and inner tables ofthe frontal bones (sums frontales) are very variable in extent and form. The relativedevelopment and general position of these cavities are usually indicated by thedegree of prominence of the superciliary ridges, but by no means invariably, sincenumerous exceptions to this correspondence occur. The sinuses are frequentlyquite asymmetrical (Fig. 1185), one cavity being enlarged, sometimes at the expenseof the other, with accompanying displacement of the intervening septum. Thelatter, usually approximately median in position, is often very thin, but only rarely 1424 HUMAN ANATOMY. incomplete, so that the spaces very seldom comiiumicate. Numerous instances havebeen obserecl in wh

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