the point at which the trachea divides is known as the
The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people.The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum). The trachea then divides into two smaller tubes called bronchi: one bronchus for each lung.The trachea is composed of about 20 rings of tough cartilage.he trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people.