Archive image from page 584 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 VEIN. 1369 This may be taken as a tabular view of the typical structure of veins of larger size, and in the smaller vessels the same order of parts is represented, but with less distinctness and greater tenuity. There are certain regions, however, where the venous texture, both in quality and order, departs considerably from the typical arrangement: these will be noticed hereafter. In the following observations, the several coats of the veins will be describ
Archive image from page 584 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 VEIN. 1369 This may be taken as a tabular view of the typical structure of veins of larger size, and in the smaller vessels the same order of parts is represented, but with less distinctness and greater tenuity. There are certain regions, however, where the venous texture, both in quality and order, departs considerably from the typical arrangement: these will be noticed hereafter. In the following observations, the several coats of the veins will be described in succes- sion, beginning with the innermost. Epithelium. — It is difficult (as has been ob- served by Henle},in all cases, to make out a dis- tinct epithelial layer lining the vascular cavity; but, as far as my observations go, it is more constant in arteries than in veins, and the epithelium is more perfectly formed in the former than in the latter. The anatomist will frequently make search in vain for epithelium on the inner surface of veins, and, when found, a perfect epithelial cell is less common than one imperfectly formed, the nucleus existing, but the cell-wall either partially or wholly absent. Fig. 853. Epithelium from the Vena Cava of a Sheep. a, perfect epithelium ; ft, common form; c, epithe- lium seen edgewise; cl, nuclei of epithelium desti- tute of cell-wall. (Magnified 200 diameters.) The best method for examining the epithe- lium is by scraping the inner surface of the vessel, and placing the material removed on a slip of glass; or by viewing the free edge of a valve under the microscope. Existing in its most perfect form the epithelium is of a dia- mond or rhomboidal figure, containing a nucleus, large in proportion to the cell, of a pranulai character, and lenticular or oval form. The nucleus is distinct and well defined. The cell itself is clear, pale, and watery to an ex- tent that it is impossible to portray in a wood- cut. Henle states that t
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