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The trachea begins at the lower edge of the cricoid cartilage of the larynx [3] at the level of sixth cervical vertebra (C6) [2] and ends at the carina, the point where the trachea branches into left and right main bronchi., [2] at the level of the fourth thoracic vertebra (T4), [2] although its position may change with breathing. [3]
The carina of trachea (also: "tracheal carina" [1]) is a ridge [1] of cartilage [2] at the base of the trachea separating the openings of the left and right main bronchi.
The trachea is the largest tube in the respiratory tract and consists of tracheal rings of hyaline cartilage. It branches off into two bronchial tubes, a left and a right main bronchus. The bronchi branch off into smaller sections inside the lungs, called bronchioles. These bronchioles give rise to the air sacs in the lungs called the alveoli. [10]
Visualising the interior of the bronchi through a bronchoscope passed through the mouth and trachea, procedure is called bronchoscopy. The carina of the trachea is a hook shaped process projecting backward from the lower margin of lowest tracheal ring. It helps to divide the trachea into two primary bronchi.
structures of the respiratory system, including the diaphragm, trachea, bronchi and lungs [1] structures of the digestive system, including the esophagus, endocrine glands, including the thymus gland, structures of the nervous system including the paired vagus nerves, and the paired sympathetic chains, lymphatics including the thoracic duct.
A medical procedure known as a cricoidectomy can be performed in which part or all of the cricoid cartilage is removed. This is commonly done to relieve blockages within the trachea. [17] Fractures of the cricoid cartilage can be seen after manual strangulation also known as throttling. [citation needed]
In humans and other mammals, the anatomy of a typical respiratory system is the respiratory tract.The tract is divided into an upper and a lower respiratory tract.The upper tract includes the nose, nasal cavities, sinuses, pharynx and the part of the larynx above the vocal folds.
The cephalic part of the tube becomes the larynx, and its next succeeding part is the trachea, while from its caudal end, a respiratory diverticulum appears as the lung bud. The lung bud branches into two lateral outgrowths known as the bronchial buds, one on each side of the trachea.