. Cunningham's Text-book of anatomy. Anatomy. Thyreoid cartilage -Crico-thyreoid membrane — Cricoid cartilage Part of trachea covered by isthmus of thyreoid body Common carotid artery Subclavian artery The trachea adheres rigorously to the median plane except towards its termination, where it de- viates very slightly to the right. As it passes down- wards it recedes rapidly from the surface. This is due to its following the curvature of the vertebral column, from which it is separated by the oesophagus alone. Relations of the Trachea.—In the study of the relations of the trachea it is conveni
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. Cunningham's Text-book of anatomy. Anatomy. Thyreoid cartilage -Crico-thyreoid membrane — Cricoid cartilage _Part of trachea covered by isthmus of thyreoid body Common carotid artery Subclavian artery The trachea adheres rigorously to the median plane except towards its termination, where it de- viates very slightly to the right. As it passes down- wards it recedes rapidly from the surface. This is due to its following the curvature of the vertebral column, from which it is separated by the oesophagus alone. Relations of the Trachea.—In the study of the relations of the trachea it is convenient to consider it in the two stages of cer- vical and thoracic. When the chin is held so that the face looks directly forwards the cervical part of the trachea measures from 2 to 2 inches in length ; but when the head is thrown dorsally or backwards the length is considerably in- creased. It is clasped by the thyreoid gland, the isthmus of which is applied to its ventral surface, and covers the second, third, and fourth rings; while on each side the lateral lobe of the thy- reoid gland is applied to the lateral surface of the trachea and extends downwards to the fifth or sixth ring. On either side of the cervical part of the trachea is the common carotid artery, whilst the recurrent nerve passes upwards in the groove between the trachea and the oesophagus. Dorsally the trachea is in relation to the oesophagus, which intervenes between it and the bodies of the vertebras and deviates somewhat to the left as it passes downwards. In addition to the isthmus of the thyreoid gland two thin muscular strata, composed of the sterno-hyoid and the sterno-thyreoid muscles, as well as the deep 69 &. parterial onchi Pulmonary artery Fig. 858.—The Trachea and Bronchi. The thyreoid gland is indicated by a dotted line and a purple tint.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan