File:The cat - an introduction to the study of backboned animals, especially mammals (1881) (19965827643).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, vii.) TEE CATS ORGANS OF CIRCULATION. 199 —begin to arise from the epithelial investment of the trabecule, and only acquire their coats, other than epithelial, as they leave the gland. # Thus^ a lymphatic gland is, as it were, an expanded sinus into which a number of lymphatics merge, and wherein it appears a multiplication of lymph corpuscles takes place, probably by spontaneous division—the parts of the corpuscles thus spontane- ously dividing growing up into whole corpuscles. Each gland is richly supplied with blood-vessels, and the lymph
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Fig. 101.—Diagrammatic Section of a Lymphatic Gland. at. Afferent lymphalics. el. Efferent lymphatics. c. Cortical substance m. Medullary substance. Is. Lymph sinus. c. Fibrous coat. tr. Trabeculae. llu Lymph corpuscles. The letter C is placed in one of the alveoli. The trabeculae are represented by a dark shade, and are seen extending inwards from the fibrous coat and as spots in the medullary substance—such spots being trabeculae cut across. At the upper right-hand part of the figure the lymph corpuscles, Ih, are repre- sented in three alveoli and in the adjacent medullary part. Elsewhere they are not represented. A whit • band is to be seen around all the alveoli, nd also round e^ch of the cut-across trabeculae in medullary substance. The band is the lymph sinus, a d the irregular lines wJiich cross it at short intervals are the connective fibres and nuclei. which leaves it is not only richer in colourless corpuscles than is that which comes to it, but also in fibrin. These glands are conspicuous in the neck, the axilla, and the thigh, and speedily enlarge in size when any part of the body near them becomes the seat of pain. § 8. The heart is a thick muscular and hollow organ, from the anterior, broad part of which great blood-vessels originate. It is enclosed in a sac of fibrous tissue lined with epithelium, called the pericardium. It consists of four chambers, two of which

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