Epiglottis an important part of the larynx is

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the corniculate, arytenoid and cuneiform. Epiglottis, an important part of the larynx is actually a cartilage that prevents food from entering the respiratory tract. The flap-like action of epiglottis is facilitated by the corniculate cartilage. Trachea: The trachea lies to the anterior side of the esophagus. It is a tubular structure with 1 inch diameter and a length of 4.25 inches. The length of trachea spans between 6th cervical and 5th thoracic vertebrae. Trachea is composed of around 15 - 20 'C' - shaped pieces of hyaline cartilage. These pieces are held together by tracheal muscles. Bronchi: The tracheal tube when divided into two at the caudal end, gives rise to left and right bronchi. Bronchus is a passage that allows air flow into lungs. Left bronchus, which is shorter than the right one, further divides into 2 lobar bronchi; right bronchus on the other hand is divided into 3 lobar bronchi. Lungs: The lungs are a pair of conical organs present in pleural cavities; both the lungs together form an important part of the human respiratory system . Left lung is divided into 2 lobes (superior and inferior) while the right one in 3 (superior, inferior and middle).
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