. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 77-1 SPLEEN. Fig. 524-. with some white fibrous tissue. As to the lower vertebrata, I have examined a great number of them with respect to this muscular structure, and have found that the smallness of the spleen in many of them offers a great obstacle to observation ; yet I believe I have verified that the spleens of the pigeon, sparrow, blindworm, tench (tinea chrysitii), and trout, contain muscular fibres. So, also, my friend Professor Ecker, of Basle, has orally commu- nicated to me that he has found very dis- tinct m
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 77-1 SPLEEN. Fig. 524-. with some white fibrous tissue. As to the lower vertebrata, I have examined a great number of them with respect to this muscular structure, and have found that the smallness of the spleen in many of them offers a great obstacle to observation ; yet I believe I have verified that the spleens of the pigeon, sparrow, blindworm, tench (tinea chrysitii), and trout, contain muscular fibres. So, also, my friend Professor Ecker, of Basle, has orally commu- nicated to me that he has found very dis- tinct muscular fibre in the spleens of the ray and shark. All these muscles are, like those of the fibrous coat, unstriped ; their elements consist of elongated shortish fibres, each possessing a long nucleus. (Fig. 523. a, Fig. 524.) In the thicker partitions there are what I call " mus- cular fibre-cells," either stiff, pale, flat, from 4 to of a line broad, and 2 long, or more cylindrical, darker, spindle- shaped, and undulating, varying from 2 to of a line in length, and 3 to in breadth. In both cases they have long, neat, small, staff-shaped, nuclei. In the finer partitions, on the contrary, appear many shorter and more spindle-shaped fibre-cells ; their nuclei are elliptical or even spherical, and they often project laterally from the fibres, so as sometimes to render these muscular elements scarcely distinguishable from the spindle- shaped epithelial cells of the splenic arteries. The muscular elements just described are seen in the best and plainest manner in the pig and dog ; but they are also readily verified in the horse, ox, ass, sheep, and cat, in all of which they may frequently be isolated. In the other mammals previously named, and in the rest of the vertebrata, they are less easily recog- nised, and are scarcely susceptible of isola- tion ; but they can al- ways be partially un- covered, and in any case may be demon-
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