File:Hand-book of physiology (1892) (14578563150).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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secreting parts of the gland. Thealveoli are composed of a basement membrane of flattened cells 3i6 FOOD AND DIGESTION. (CH. VIII. joined together by processes to produce a fenestrated membrane,the spaces of which are occupied by a homogeneous ground-substance. Within, upon this membrane, which forms the tube,the nucleated salivary secreting cells, of cubical or columnarform, are arranged parallel to one another enclosing a centralcanal. The granular appearance frequently seen in the salivarycells is due to the very dense network of fibrils which theycontain. When isolated, the cells not unfrequently are found tobe branched. Connecting the alveoli into lobules, is a consider-able amount of fibrous connective tissue, which contains bothflattened and granular protoplasmic cells, lymph corpuscles, andin some cases fat cells. The lobules are connected to formlarger lobules (lobes), in a similar manner. The alveoli pass intothe intralobular ducts by a narrowed portion (intercalary), lined
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Fig. 221. -Section of sub-maxillary gland of dog. Showing gland cells, b, and a duct, a,in section. (Kolliker.) with flattened epithelium with elongated nuclei. The intercalaryducts pass into the intralobular ducts by a narrowed neck, linedwith cubical cells with small nuclei. The intralobular duct islarger in size, and is lined with large columnar nucleated cells,the parts of which, towards the lumen of the tube, present a finelongitudinal striation, due to the arrangement of the cell net-work. It is most marked in the submaxillary gland. The intra-lobular ducts pass into the larger ducts, and these into the mainduct of the gland. As these ducts become larger they acquirean outside coating of connective tissue, and later on some un-striped muscular fibres. The lining of the larger ducts consistsof one or more layers of columnar epithelium, the cells of whichcontain an intracellular network of fibres arranged longitudinally.Varieties.—Certain differences in the structure of salivary

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