File:The cat - an introduction to the study of backboned animals, especially mammals (1881) (20398594638).jpg

Title: The cat : an introduction to the study of backboned animals, especially mammals
Identifier: catintroduction00miva (find matches)
Year: 1881 (1880s)
Authors: Mivart, St. George Jackson, 1827-1900
Subjects: Cats; Anatomy, Comparative
Publisher: New York : Scribner's
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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CHAP. II.) THE CATS GENERAL FORM. 17 flattened in shape, sometimes giving off ramifying processes, which may unite with branches from neighbouring connective-tissue cor- puscles. Within the corpuscle is a round or oval nucleus, which contains one or more nucleoli* The structureless substance and fibres form what is called the matrix of the tissue, and the cor-
Text Appearing After Image:
Fig. 3.-- Connective, Adipose and Elastic Tissue. Loose areolar tissue -with fat cells. The fat cells. and C. Magnified view of areolar tissue treated with acetic acid. The white fibres are here no longer seen, and the yellow or elastic fibres with the nuclei come into view. In Fig. B, a series of constrictions is produced by the presence of an elastic fibre, which is spirally disposed about the (here swollen and invisible) white fibres. The white fibres may be 50000 0I" an incn in thickness or even less. Fibres of yellow or elastic tissue. puscles are cells which are thus more or less plentifully distributed within the matrix. Intermixed with the ordinary fibres may be others of a yellower colour (and with a different chemical reaction), known as " elastic fibres," or elastic tissue." These fibres may be rendered con- spicuous under the microscope by the addition of acetic acid, which causes the white fibres to swell and become indistinct, thus revealing the existence of the unaffected yellow ones. * It may be well to remind the reader that the body of every animal, and there- fore of the cat, consists at first of a single "cell," or minute particle of protoplasm, and afterwards, for a time, of an aggre- gation of such cells whence all the tissues of the body are ultimately derived, and which in different degrees preserve traces of their cellular origin. Cells commonly I contain a modified internal part or parts called a nucleus or nuclei, when they are said to be "nucleated." It is very common for the nucleus to again con- I tain a more minute internal particle, i ; termed a "nucleolus," or it may have i several nucleoli. Thus, the connective- tissue corpuscles are "nucleated cells." C

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