. Anatomy, descriptive and surgical. Front View of Cartilages of Larynx: the Trachea and Bronchi. dorsal vertebra, about an inch lower than the right bronchus. It passes beneaththe arch of the aorta, crosses, in front of the oesophagus, the thoracic duct and the descending aorta, and has the left pulrno- Fig. 615. Left- Kis&t nary artery lying at first above, and thenin front of it. If a transverse section ismade across the trachea a short distanceabove its point of bifurcation, and abirds-eye view taken of its interior(Fig. 615), the septum placed at thebottom of the trachea and separatingthe
. Anatomy, descriptive and surgical. Front View of Cartilages of Larynx: the Trachea and Bronchi. dorsal vertebra, about an inch lower than the right bronchus. It passes beneaththe arch of the aorta, crosses, in front of the oesophagus, the thoracic duct and the descending aorta, and has the left pulrno- Fig. 615. Left- Kis&t nary artery lying at first above, and thenin front of it. If a transverse section ismade across the trachea a short distanceabove its point of bifurcation, and abirds-eye view taken of its interior(Fig. 615), the septum placed at thebottom of the trachea and separatingthe two bronchi will be seen to occupythe left of the median line, as was firstshown by Mr. Goodall of Dublin, so thatany solid body dropping into the tracheawould naturally be directed toward theright bronchus; and this tendency is undoubtedly aided by the larger size of this. Transverse Section of the Trachea, just above its bi-furcation, with a birds-eye view of the interior. THE TRACHEA. 929 tube as compared with its fellow. This fact serves to explain why a foreign sub-stance in the trachea generally falls into the right bronchus. Structure.—The trachea is composed of imperfect cartilaginous rings, fibrousmembrane, muscular fibres, longitudinal yellow elastic fibres, mucous membrane,and glands. The Cartilages vary from sixteen to twenty in number: each forms an imper-fect ring, which surrounds about two-thirds of the cylinder of the trachea, beingimperfect behind, where the tube is completed by fibrous membrane. The carti-lages are placed horizontally above each other, separated by narrow membranousintervals. They measure about two lines in depth and half a line in outer surfaces are flattened, but internally they are convex, from being thickerin the middle than at the margins. The cartilages are enclosed in an elastic fibrousmembran
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
