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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 trachea is made of smooth MUSCLE tissue along the back wall with 16 to 20 C-shaped bands of CARTILAGE running along its length. The cartilage rings give the trachea stability and resistance against the pressure of air flow into and out of the lungs.he trachea is made of smooth MUSCLE tissue along the back wall with 16 to 20 C-shaped bands of CARTILAGE running along its length. The cartilage rings give the trachea stability and resistance against the pressure of air flow into and out of the lungs.