. Cunningham's Text-book of anatomy. Anatomy. 186 OSTEOLOGY. Perpeiii Frontal sinus / Crista galli of ethmoid Cribriform plate of ethmoid Sphenoidal sinus Sella turcica Dorsum sellre of sphenoid The sinus in the orbital process of the palate bone either communicates with the sphenoidal sinus, or else assists in closing in some of the posterior ethmoidal cells. Its communication with the nasal cavity is through one or other of these spaces. The maxillary sinus lies to the lateral side of the nasal cavity, occupying the body of the maxilla. Its walls, which are relatively thin, are directed upwa
. Cunningham's Text-book of anatomy. Anatomy. 186 OSTEOLOGY. Perpeiii Frontal sinus / Crista galli of ethmoid Cribriform plate of ethmoid Sphenoidal sinus Sella turcica Dorsum sellre of sphenoid The sinus in the orbital process of the palate bone either communicates with the sphenoidal sinus, or else assists in closing in some of the posterior ethmoidal cells. Its communication with the nasal cavity is through one or other of these spaces. The maxillary sinus lies to the lateral side of the nasal cavity, occupying the body of the maxilla. Its walls, which are relatively thin, are directed upwards to the orbit, forwards to the face, backwards to the infra-temporal and pterygo-palatine fossas, and medially to the nose. In the latter situation the perpendicular part of the palate bone, the un- cinate process of the ethmoid, the maxillary process of the inferior concha, and a small part of the lacrimal bone assist in the formation of the thin osseous partition which separates it from the nasal cavity. The floor corre- sponds to the alveolar border of the maxilla, and differs from the other walls in being stout and thick; it is, how- ever, deeply pitted inferiorly by the alveoli for the teeth. The sinus opens by a narrow orifice in the floor of the hiatus semilunaris into the middle meatus. Occasionally there are two igular spine openings. of sphenoid r ° The frontal sinuses lie, one on either side, between the inner and outer tables of the frontal bone over the root of the nose, and extend laterally under the super- The frontal, maxillary, and sphenoid bones are coloured red ; the nasal, P1'liarv ovphpo Thf> -narfi vomer, and basi-occipital blue ; the perpendicular partof the ethmoid ~7 J °"^ J. nv par bl- and the horizontal part of the palate bone are left uncoloured. tion Which separates them is usually central, though it may be deflected to one or other side. They communicate with the nose through a passage called the infundibulum, which opens inferior
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