. Elements of histology. Histology. 78 Elements of Histology. [Chap. x. former, in the smaller arteries the reverse is the case. In microscopic branches of arteries the media consists almost entirely of cir- cular non-striped muscle cells with only few elas- tic fibres. 100. In the last branches of the micro- scopic arteries, the mus- cular media becomes dis- continuous, inasmuch as the (circular) muscular cells are arranged not as a continuous membrane, but as groups of small cells (in a single layer) in a more or less alter- nate fashion. When the media contracts, the intima is placed in lon
. Elements of histology. Histology. 78 Elements of Histology. [Chap. x. former, in the smaller arteries the reverse is the case. In microscopic branches of arteries the media consists almost entirely of cir- cular non-striped muscle cells with only few elas- tic fibres. 100. In the last branches of the micro- scopic arteries, the mus- cular media becomes dis- continuous, inasmuch as the (circular) muscular cells are arranged not as a continuous membrane, but as groups of small cells (in a single layer) in a more or less alter- nate fashion. When the media contracts, the intima is placed in longitudinal folds. The aorta has, in the innermost and in the outermost parts of the media, numbers of lon- gitudinal and oblique muscle cells. Accord- to Bardeleben, all and middle-sized. Fig. 46.—Transverse Section through a Microscopic Artery and Vein in the Epiglottis of a Child. A, The artery, showing the nucleated endothelium, the circular muscular media, and at«the fibrous-tissue adven- titia; v, the vein, showing the same layers ; the media is very much thinner than in the artery. (Atlas.) ing large arteries have an inner longitudinal muscular coat. 101. Between the media and the next outer layer there is, in larger and middle-sized arteries, a special elastic membrane, the elastica externa of Henle. (d) The adventitia is a relatively thin fibrous con- nective tissue membrane. In large and middle-sized arteries there are numbers of elastic fibres present,. 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 resemble the original Klein, E. (Edward), 1844-1925. Philadelphia : H. C. Lea's Son
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