. Smell, taste, and allied senses in the vertebrates . Senses and sensation; Vertebrates. 96 SMELL, TASTE, ALLIED SENSES 111 all these higher vertebrates the olfactory organ proper corresponds to the lateral component of the pair of organs in the lower forms and the vomero-nasal organ to the median member of this group (Fig. 23). 3. Histology. The vomero-nasal organ of the dog and the cat, as described by Read (1908), is a tubular organ whose transverse section is circular in out- line near its opening and crescentic or kidney- shaped throughout its greater extent. Its median wall may be two t
. Smell, taste, and allied senses in the vertebrates . Senses and sensation; Vertebrates. 96 SMELL, TASTE, ALLIED SENSES 111 all these higher vertebrates the olfactory organ proper corresponds to the lateral component of the pair of organs in the lower forms and the vomero-nasal organ to the median member of this group (Fig. 23). 3. Histology. The vomero-nasal organ of the dog and the cat, as described by Read (1908), is a tubular organ whose transverse section is circular in out- line near its opening and crescentic or kidney- shaped throughout its greater extent. Its median wall may be two to three times as thick as its lateral wall. This thickened por- tion, which has been observed by numerous workers in a variety of mammals, is similar in cellular composition to the olfactory epithelium of the nose and is in strong contrast with the lateral thin wall which resembles respiratory nasal epithelium. Read has shoMoi that the vomero-nasal organ of the cat and the dog is like the olfactory region of the nose in that it receives nerve fibers from two sources, the olfactory nerve and the trigeminal nerve. As early as 1892 von Brunn showed that the sense cells of the vomero-nasal organ of the sheep were con- nected with nerve fibers in exactly the way they were in the olfactory region proper and he assumed, probably. Fig. 22.—Transverse section of the head of a snake embryo (Agkistrodon) showing the nasal canal proper (n) and the large vomero-nasal (v) organ opening on the roof of the mouth. Preparation by Mr. F. B. 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 Parker, George Howard, 1864-1955. Philadelphia ; London : J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsensesa, bookyear1922
