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Human anatomy, including structure and development and practical considerations . pending upon the number of those associated to compose the gland.These units correspond to the groups of terminal compartments, or alveoli, con-nected with a single ultimate division of the duct-system. The alveoli or acini containthe secreting cells, and are limited externally by a basement membrane, often welldeveloped, which supports the glandular epithelium and separates the latter from theblood- and lymph-vessels that surround the acinus. The alveoli belonging to the same intermediate duct, held together by

Human anatomy, including structure and development and practical considerations . pending upon the number of those associated to compose the gland.These units correspond to the groups of terminal compartments, or alveoli, con-nected with a single ultimate division of the duct-system. The alveoli or acini containthe secreting cells, and are limited externally by a basement membrane, often welldeveloped, which supports the glandular epithelium and separates the latter from theblood- and lymph-vessels that surround the acinus. The alveoli belonging to the same intermediate duct, held together by Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2ANEE45

File size:

7.1 MB (198.5 KB Compressed download)

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Dimensions:

1271 x 1966 px | 21.5 x 33.3 cm | 8.5 x 13.1 inches | 150dpi

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Human anatomy, including structure and development and practical considerations . pending upon the number of those associated to compose the gland.These units correspond to the groups of terminal compartments, or alveoli, con-nected with a single ultimate division of the duct-system. The alveoli or acini containthe secreting cells, and are limited externally by a basement membrane, often welldeveloped, which supports the glandular epithelium and separates the latter from theblood- and lymph-vessels that surround the acinus. The alveoli belonging to the same intermediate duct, held together by delicateconnective tissue, constitute a pyramidal mass of glandular tissue, xSm^primary lobules.The latter are assembled into larger groups, or secondary lobules, which in turn areunited by interlobular connective tissue into the lobes composing the entire gland.The lobes are held together more or less firmly by the interlobar areolar tissuecontinuous with the general fibrous envelope, which forms a caj^sule for the entireorgan and separates it from the surrounding structures.. Intralobulurduct termediateduct Beginning ofduct in alveoli Terminalalveolus Diagram .showing relations of various portions of duct-system in glands of tubo-alveolar type. GLANDS. 153.^ The interlobar tissue and its interlobular continuations contain the blood-vessels, lymphatics, and neres supplyinj^ the inland and, in addition, the niajcjr p<jrtion (jfthe excretory ducts. In the larger i^lanils the latter form an elaborate system of ])as-sa^es arranj^ed after the j^eneral plan shown in the accompanying diagram ( Vl^.1285). Traced from the terminal compartments, or alveoli, of the gland, the duct-system begins as a narrow canal, the intirvndiatc duct, lined by low cuboidal or flat-tened cells directly continuous with the glandular epithelium of the alveoli. After ashort course the tube increases in diameter and becomes the intralobular duct, whichis often conspicuous on account of its tall and someti

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