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The trachealis muscle is a smooth muscle that bridges the gap between the free ends of C-shaped cartilages at the posterior border of the trachea, adjacent to the esophagus.The primary function of the trachealis muscle is to constrict the trachea, allowing air to be expelled with more force e.g. during coughing.he trachealis muscle is a smooth muscle that bridges the gap between the free ends of C-shaped cartilages at the posterior border of the trachea, adjacent to the esophagus. The primary function of the trachealis muscle is to constrict the trachea, allowing air to be expelled with more force e.g. during coughing.
The ends of the incomplete rings are joined by the smooth trachealis muscle. The structural conformation of the trachea prevents collapse due to traction forces, whilst allowing it to adjust in length and diameter, as the neck moves and the diaphragm contracts.he trachea is the tube linking the cricoid cartilage of the larynx to the bronchi, forming part of the conducting system which transports air from the external environment to the lungs. The oesophagus lies dorsally to the trachea.