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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.
The tracheal cartilages have an order, starting with the peculiar tracheal cartilages. These are the first and last rings in the trachea. The first cartilage is broad and divided at the end.It sometimes blends in with the following cartilage, depending on the structure of the trachea. The last cartilage is broad in the middle and thick, with a triangular shape for a lower border.he tracheal cartilages have an order, starting with the peculiar tracheal cartilages. These are the first and last rings in the trachea. The first cartilage is broad and divided at the end.