. The anatomy of the human body. Human anatomy; Anatomy. THE LUNGS. 417 umn. The left recurrent nerve is situated in the groove formed between the trachea and the (Esophagus in this direction ; the right recurrent nerve hes behind the trachea. The immediate relation of the trachea with the oesophagus explains why foreign bodies arrested in the gullet may produce suffocation, and require the performance of trache- otomy. The softness and flexibility of the trachea opposite the oesophagus have appeared to some physiologists to be intended merely to facilitate the dilatation of the latter during
. The anatomy of the human body. Human anatomy; Anatomy. THE LUNGS. 417 umn. The left recurrent nerve is situated in the groove formed between the trachea and the (Esophagus in this direction ; the right recurrent nerve hes behind the trachea. The immediate relation of the trachea with the oesophagus explains why foreign bodies arrested in the gullet may produce suffocation, and require the performance of trache- otomy. The softness and flexibility of the trachea opposite the oesophagus have appeared to some physiologists to be intended merely to facilitate the dilatation of the latter during the passing of the food ; but we shall see that the air-tubes continue to be membranous, behind, even where they have no relation with the oesophagus, and comparative anatomy, which shows the trachea to be cylindrical in the bird, and angular behind in the ox, the sheep, &c., most completely refutes this opinion. Relations of the Thoracic Portion of the Trachea.—In the thorax, the trachea occupies the posterior mediastinum. It corresponds in front, proceeding from above downward, with the sternum and the sterno-thyroid muscles ; with the left brachio-cephalic vein (c, fig. 170); with the brachio-cephahc artery (h), an aneurism of which may open into the trachea; its left side is, as it were, embraced between the brachio-cephalic artery (li) and the left common carotid (;); with the back part of the arch of the aorta {g), which rests immediately upon it, and hence the dyspnoea which so generally accompanies aneu- rism of the aorta, and the frequency of its bursting into the windpipe ; and, lastly, lower down, with the bifurcation of the pulmonary artery, which corresponds with that of the trachea. The trachea is in relation behind with the oesophagus, which separates it from the spinal column ; and on the sides with those portions of the pleura; which form the mediastinum, with the pneumogastric nerves, and with the upper part of the recurrent nerves. In all its thoracic p
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
