File:Quain's elements of anatomy (1882) (14592958707).jpg

Identifier: quainselementsof82quai02 (find matches)
Title: Quain's elements of anatomy
Year: 1882 (1880s)
Authors: Quain, Jones, 1796-1865 Thomson, Allen, 1809-1884 Sharpey-Schäfer, E. A. (Edward Albert), Sir, 1850-1935, ed Thane, George Dancer, 1850-1930
Subjects: Human anatomy Anatomy
Publisher: London : Longmans, Green
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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d by a short projection (fig. 414-, 2, c), but this appearance may result fromthe coagulation of albuminous matter escaped from the interior of the process.Long and fine hair-like processes do, however, exist on the olfactory-cells ofamphibia, reptiles, and birds (fig. 414,1, c), but they have not been observed inmammals. According to Exner there is no sharp distinction between columnar andolfactory-cells, but intermediate forms are to be met with, and the olfactory-cells are. in fact, only a less developed condition of the columnar cells. He statesthat both kinds are connected with the olfactory nerve-fibres, that in the lowervertebrata they may both bear hair-like processes, and that in the frog, afterremoval of the olfactory lobes, they both disappear and give place to ordinaryciliated cells. In the rabbit and guinea-pig Klein, in confirmation of a statement by Sidney,describes a lowermost layer of conical cells resting by their bases vertically uponthe basement membrane. Tig. 415.
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Fig. 415.—Neeves of the sevtum nasi, seen from the eight side (from Sappey,after Hirschfeld and Leveille). -§■ I, the olfactory bulb ; 1, the olfactory nerves passing through the foramina of thecribriform plate, and descending to be distributed on the septum ; 2, the internal orseptal twig of the nasal branch of the ophthalmic nerve ; 3, naso-palatine nerves. Olfactory ITerve.—The filaments of this nerve, lodged at first ingrooves on the surface of the bones, enter the substance of theSchneiderian membrane obliquely. The nerves of the septum (fig. 415)are rather larger than those of the outer wall of the nasal fossas; theyextend over the upper third of the septum, becoming very indistinctas they descend. The nerves of the outer wall are divided into two OEGAX OF JACOBSOX. 475 groups—the posterior being distributed over the surface of the uppertuibmate bone, and the anterior over tlie plain surface of the ethmoidand the middle turbinate bone. The nerves ramify so as to form fl

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