. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. OLFACTORY ORGAN" 203 teriorly to it. This turbinal is comparable to that of Urodeles and Reptiles. The so-called external nasal gland of Birds is situated on the frontal or nasal bones, along the upper margin of the orbit. It is supplied by the first and second branches of the trigeminal, and corresponds to the lateral nasal gland of Lizards. ojin. Jijp Fig. 162.âTransverse SECTION THEOUflH THE Rif:HT NasaIj Cavity OF A Shrike { minor.) 0^f, J/J/, superior (pseudo) and middle (true) tarbinal; a, upper, and
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. OLFACTORY ORGAN" 203 teriorly to it. This turbinal is comparable to that of Urodeles and Reptiles. The so-called external nasal gland of Birds is situated on the frontal or nasal bones, along the upper margin of the orbit. It is supplied by the first and second branches of the trigeminal, and corresponds to the lateral nasal gland of Lizards. ojin. Jijp Fig. 162.âTransverse SECTION THEOUflH THE Rif:HT NasaIj Cavity OF A Shrike { minor.) 0^f, J/J/, superior (pseudo) and middle (true) tarbinal; a, upper, and h, lower nasal passage ; LB, air - chamber, wliicli extends into a hollow of the superior tur- binal. Mammals.âCorresponding to the much more marked development of the facial por- tion of the skull, the nasal cavity of Mammals is proportionately much larger than in the forms yet described, and consequently there is much more room for the extension of the turbinals: these give rise to a spongy laby- rinth, the cell-like compartments of which are lined by mucous membrane ; and thus variously shaped projections, supported partly by cartilage and partly by bone, are seen ex- tending into tlie nasal cavity (Fig. 163, A-c). The normal number of these true olfactory ridges or scrolls varies considerably.^ They may be arranged in one row (Ornithorhyn- â chus, Cetacea, Pinnipedia, Primates), or in several rows (other Mammals), in which latter case the olfactory lobes are largely developed. According to the degree of development of the olfactory appa- ratus, taking specially into account its cerebral portion (olfactory lobes), we may distinguish between Mammals which are macros- matic (the majority of the mammalian orders), microsmatic (Seals, Whalebone Whales, Monkeys, Man), and anosmatic (most Toothed Whales). The above-mentioned olfactory scrolls belong to the true olfac- tory region, and are generally described as " ethmoid turlinals," as in all but the first of the seri
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
