. Carnegie Institution of Washington publication. 288 MORPHOLOGICAL STUDY OF TRACHEAL AND BRONCHIAL CARTILAGES. forms two processes below, one of which belongs to each vessel of the division. The free margin of the cartilage, placed at the orifice of an air-tube, is always concave and sharp, and is surmounted by a band of yellow elastic tissue. At the points of origin of the smaller air-tubes, the cartilages exist as thin semilunar pieces, with sharp concave margin looking upwards; these becoming smaller, at length ; Heller and v. Schrotter studied the car- tilages which enter i
. Carnegie Institution of Washington publication. 288 MORPHOLOGICAL STUDY OF TRACHEAL AND BRONCHIAL CARTILAGES. forms two processes below, one of which belongs to each vessel of the division. The free margin of the cartilage, placed at the orifice of an air-tube, is always concave and sharp, and is surmounted by a band of yellow elastic tissue. At the points of origin of the smaller air-tubes, the cartilages exist as thin semilunar pieces, with sharp concave margin looking upwards; these becoming smaller, at length ; Heller and v. Schrotter studied the car- tilages which enter into the formation of the carina tracheae and, although shown by flat drawings, they indicate better than any previous illustrations the bizarre forms which the tracheal cartilages often assume. In a study of the carina tracheae of the domestic cat, made by the author of this paper, a similar method of illustration was used, but while it served the purpose it did not in the end prove satisfactory. Schaf er, describing the cartilages within the lungs, says: [They] "no longer appear as imperfect rings running only upon the front and lateral surfaces of the air tubes, but are disposed over all sides of the tubes in the form of irregular- shaped plates and incomplete rings of vari- ous sizes. These are most developed at the points of division of the bronchia, where they form a sharp concave ridge projecting inwards into the ; Further quotations are unnecessary, for all the descriptions of the bronchial cartilages seem to have taken their color- ing from the original descriptions given by Homer and by King. No one, however, has followed out the plastic representation of the cartilages first attempted by King. In longitudinal sections of the trachea or of the bronchi a considerable number of so-called plates are seen (fig. 10) and it was a desire to see in plastic form the shape and arrangement of these plates that led to the present study. Cuvier was the first to point
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