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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.
1 The larynx may be felt as the Adam's apple in front of the neck (Figures 1 and 2) 2  The trachea is a tube that runs from the bottom of the larynx into the chest where it divides into the bronchi, the tubes that go to each of the lungs.  The thyroid gland lies in front of the trachea.