. Carnegie Institution of Washington publication. . FIG. 2.—Outline of the section along the line A, in figure 1. Note cir- cular outline of the section. The numbers 2, 3, 4 indicate the carti- lages through which the plane of the section passes. X6. FIG. 3.—Outline of the section along the line B in figure 1. Note the outline of the lumen of the trachea; it has notonly adurab-bell shape, but, there is also a marked anterior swing of what is to be the right bronchus. 1 B, section of the first right bronchial cartilage; C, C, sections of the carinal cartilage. X6. HUMAN TRACHEA AND BRONCHI. Tra
. Carnegie Institution of Washington publication. . FIG. 2.—Outline of the section along the line A, in figure 1. Note cir- cular outline of the section. The numbers 2, 3, 4 indicate the carti- lages through which the plane of the section passes. X6. FIG. 3.—Outline of the section along the line B in figure 1. Note the outline of the lumen of the trachea; it has notonly adurab-bell shape, but, there is also a marked anterior swing of what is to be the right bronchus. 1 B, section of the first right bronchial cartilage; C, C, sections of the carinal cartilage. X6. HUMAN TRACHEA AND BRONCHI. Trachea.—The cartilages of the human trachea present marked irregularities (fig. 1). The first of the cartilages is incomplete and must therefore be left out of the account; the two following cartilages are regular in their formation; the next five are either fused cartilages or are bifurcated, and have one or more irregular openings, evidently due to incomplete development, for they give passage to neither blood-vessels, nerves, nor gland ducts. The carinal cartilage is interesting, being formed by the fusion of tracheal and left bronchial cartilages (fig. 4); both elements present bifurcations and irregularities of outline. Right bronchial cartilages.—The first bronchial cartilage on the right side con- sists of two elements which fuse as they arch around the mesial side of the bronchus. The next cartilage is a typical crescent. Immediately below this cartilage the eparterial bronchus is given off, and the cartilage placed at this point has a com- plicated structure, part of it belonging to the eparterial bronchus and part of it to the main stem bronchus. The portion belonging to the eparterial bronchus. 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 Carnegie Institution of Washington. Washington, Ca
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