. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 121.—Vertical section through the cav- ity of the nostril: rm, roof of mouth; opl, orbital plate ; cpl, cribriform plate. SENSE ORGANS. I go the skeleton it is largely, though not entirely, exposed. It is bounded on each side by parts of the maxillary bone, and the orbital plates of the ethmoid, opl; above, it is sepa- rated from the brain cavity by a thin plate perforated with many holes—the cribriform or colander plate of the ethmoid, cpl—and below, from the mouth cavity, b
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 121.—Vertical section through the cav- ity of the nostril: rm, roof of mouth; opl, orbital plate ; cpl, cribriform plate. SENSE ORGANS. I go the skeleton it is largely, though not entirely, exposed. It is bounded on each side by parts of the maxillary bone, and the orbital plates of the ethmoid, opl; above, it is sepa- rated from the brain cavity by a thin plate perforated with many holes—the cribriform or colander plate of the ethmoid, cpl—and below, from the mouth cavity, by the palatal plates, which form the roof of the mouth and floor of the nasal cav- ity, rm. It is divided into two symmetric halves (right and left nostril) by a bony septum, the vomer, which is con- tinued into the car- tilaginous septum of the nose. Each nos- tril is again divided by the turbinated or scroll bones into an upper and lower part, which differ in struc- ture and function. The lower part is comparatively sim- ple, the upper part complex; the one is lined with the ordinary epithelium of the alimentary passages, the other by a peculiar smooth Fig. 122.—Vertical fore-and-aft section through one nostril, showing the olfactory nerve coming down from the olfactory lobe and the nerve of feeling coming from Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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