. The comparative anatomy of the domesticated animals. Veterinary anatomy. GLAND-VESICLES, WITH THEIR EXCRETORY ULTIMATE FOLLICLES, OR GLAND-VESICLES, DUCTS TERMINATING IN A DUCTUS LAC- WITH THEIR EPITHELIUM OR SECRETING TIFEROUS: FROM A MERCURIAL INJECTION CELLS, a, a, AND NUCLEI, 6, 6. (magnified FOUR TIMES). They are -^ of an inch in diameter.) The lactiferous ducts commence by blind extremities, and run into each other to constitute a certain number of principal canals ; these open into the galactophorous sinuses (each a saccidus vel sinus lactiferus). The glandular culs-de-sac are lined w
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. The comparative anatomy of the domesticated animals. Veterinary anatomy. GLAND-VESICLES, WITH THEIR EXCRETORY ULTIMATE FOLLICLES, OR GLAND-VESICLES, DUCTS TERMINATING IN A DUCTUS LAC- WITH THEIR EPITHELIUM OR SECRETING TIFEROUS: FROM A MERCURIAL INJECTION CELLS, a, a, AND NUCLEI, 6, 6. (magnified FOUR TIMES). They are -^ of an inch in diameter.) The lactiferous ducts commence by blind extremities, and run into each other to constitute a certain number of principal canals ; these open into the galactophorous sinuses (each a saccidus vel sinus lactiferus). The glandular culs-de-sac are lined with a polyhedral epithe- lium when the gland is inactive ; but during lactation the alveoli enlarge, their walls become thickened by a regular epithelial layer, and their cavities filled with spherical cells which are infiltrated by a great quantity of fat. Placed at the base of the teat, the galactophorous sinuses or reservoirs are generally two in number, but sometimes there are three, and even four. They nearly always communicate with each other, and are continued into the mam- milla by an equal number of independent excretory canals—the definitive dmtSy the orifices of which are very small, and are seen beside each other at the free extremity of the teat. A fine mucous membrane lines the inner face of this excretory apparatus ; it is doubled in the teat by a thick layer of tissue, which, again, is covered by the skin that adheres closely to it. (Between the external and internal tunic of the teats are found numerous fasciculi of unstriped muscular fibres, arranged in a circular and longitudinal manner around these ducts.) Connective and adipose tissue, vessels, and nerves complete this organization. The arteries are from the external pudic trunk ; the veins are very numerous.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemb