. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 272 then be accepted as a fixed conclusion in the histology of the lungs that the air-cells are lined internally by a single layer of "hyaline ; This conclusion is corroborated by the minute structure of the respiratory organs in nil animals. In none are the vessels absolutely naked. Elastic Tissue of the Air-Cel/s. — The exist- ence of this tissue is admitted by every ana- tomist who has studied the subject. Its dis- position amid the air-cells is less known. It fulfils a part, though mechanical, of
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 272 then be accepted as a fixed conclusion in the histology of the lungs that the air-cells are lined internally by a single layer of "hyaline ; This conclusion is corroborated by the minute structure of the respiratory organs in nil animals. In none are the vessels absolutely naked. Elastic Tissue of the Air-Cel/s. — The exist- ence of this tissue is admitted by every ana- tomist who has studied the subject. Its dis- position amid the air-cells is less known. It fulfils a part, though mechanical, of the high- est consequence to the movement of the lungs in respiration. The fibres of this tissue belong to the yellow variety. They resist both the action of acetic acid and liquor potassae. They are most visible in the lungs of the ce- Fig. 221. RESPIRATION, ORGANS OF. air and the blood. These two elements are separated only by a slender hyaline lamina Fig. (After S. Van der Kolk.} a, b, elastic tissue (with thick yellow fibres) bounding an air-cell in the lung of the whale; c, a small portion of the wall of the same, showing the capillary weh injected. tacei. They are readily detected in those of all mammals. They are limited chiefly, in distribution, to the edges and margins of cells. They encircle foramina, and maintain them by their elasticity, in a patnlous state. They not unfrequently arch over the roof of the air-cells, constituting to the latter true irabeculce. They pass from cell to cell, and form an important connecting tissue. They are everywhere arranged in bands or fascicles, or in a large meshed net- work of single fibres, as shown in the adjoined figure. When they are distributed over the flat surface of an air-cell, they are situated im- mediately under the epithelium. As there are two epithelial surfaces to each cell-wall, the intermediate vascular plexus being single, it follows that the elastic fibres must run over and between this plexus on both
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