Surgical anatomy : a treatise on human anatomy in its application to the practice of medicine and surgery . with a probe search for the orifices of the sphenoid sinus and poste-rior ethmoid cells; remove the anterior portion of the middle turbinated bone, tofind the orifices of the antrum of Highmore, anterior ethmoid cells, and the in-fundibulum, and cut away the anterior portion of the inferior turbinated bone to seethe inferior opening of the lacrymo-nasal duct. The frontal and sphenoid sinuseshave been opened in sawing through the skull, so they can be satisfactorily studied. The frontal s
Surgical anatomy : a treatise on human anatomy in its application to the practice of medicine and surgery . with a probe search for the orifices of the sphenoid sinus and poste-rior ethmoid cells; remove the anterior portion of the middle turbinated bone, tofind the orifices of the antrum of Highmore, anterior ethmoid cells, and the in-fundibulum, and cut away the anterior portion of the inferior turbinated bone to seethe inferior opening of the lacrymo-nasal duct. The frontal and sphenoid sinuseshave been opened in sawing through the skull, so they can be satisfactorily studied. The frontal sinuses are situated between the inner and outer tables of thefrontal bones, at the position of the superciliary eminences and glabella. They areabsent before the seventh year, when they originate as extensions of the anteriorethmoid cells, and reach their full development at about the twentieth anterior or external bony wall of the sinuses is the thicker of the two, and,upon careful examination, it can usually be seen to consist of two laminae, between PLATE CCXXV. Sphenoid cells Apex of orbit. POSTERIOR VIEW OF NASAL THE NOSE. 311 which there is a thin diploic layer. The weakest ancT thinnest jiortion of thisexternal wall is just above the inner angle of the orbit, and when a collection ofpus in the frontal sinus bursts externally, it is usually at this point that the open-ing occurs. Such a fistulous opening may be mistaken by the careless observerfor a fistula lachrymalis. The frontal sinuses are extremely variable in size and form. A thin osseouspartition usually separates one sinus from the other; this septum may, however,be incomplete. In many these sinuses extend backward for a considerabledistance over the roof of the orbit. Additional septa may divide the cavity intosubcompartments, and, furthermore, one or two of the ethmoid cells may bulgeinto the sinus. In women they are comparatively small. In some individualsthey are quite small, or even
Size: 1400px × 1786px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
