. Cunningham's Text-book of anatomy. Anatomy. FRONTAL SECTIONS OF THE CRANIUM. 187 meatus below, is seen with the middle concha medial to it, and the anterior ethmoidal cells to its lateral side above. If the section passes through the canal for the naso- lacrimal duct the continuity of that channel leading from the orbit above to the inferior meatus of the nose below is clearly shown. Its medial wall above, by which it is separated from the cavity of the nose, is formed by the thin lacrimal bone; below, it passes under cover of the inferior concha to open into the anterior part of the inferio
. Cunningham's Text-book of anatomy. Anatomy. FRONTAL SECTIONS OF THE CRANIUM. 187 meatus below, is seen with the middle concha medial to it, and the anterior ethmoidal cells to its lateral side above. If the section passes through the canal for the naso- lacrimal duct the continuity of that channel leading from the orbit above to the inferior meatus of the nose below is clearly shown. Its medial wall above, by which it is separated from the cavity of the nose, is formed by the thin lacrimal bone; below, it passes under cover of the inferior concha to open into the anterior part of the inferior meatus. It is. Fig. -Part of the Frontal, Nasal, and Maxillary Bones removed in order to display the relation of the various cavities exposed. The frontal and maxillary bones, where cut, are coloured blue ; the ethmoid and the inferior concha red ; the lacrimal and vomer Yellow. 1. Frontal sinus. 2. Septum of frontal sinus deflected towards the right. 3. Infundibulum leading from sinus to middle meatus. 4. Anterior ethmoidal air-sinuses. 5. Middle concha. 6. Red line in upper part of osseous canal for naso- lacrimal duct, laid open throughout its entire length on the right side. 7. Cavity of maxillary sinus laid open. 8. Middle meatus of nose. 9. Inferior meatus of nose. 10. Inferior concha. 11. Xasal septum. 12. Canal for naso-lacrimal duct laid open through- out its entire length. 13. Anterior nasal spine. separated from the maxillary sinus laterally by a thin lamina of bone. The cavity of the maxillary sinus is seen to extend upwards and forwards so as to pass over the lateral side as well as slightly in front of the canal for the naso-lacrimal duct. The lower margins of the middle concha? lie pretty nearly on a level with the most dependent parts of the orbital margins, whilst the lower borders of the inferior concha? are placed a little above the lower margin of the piriform opening on a level with the lowest point of the zygomatico-maxillary suture. Such a section
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
