what is trachea. and rings of cartilage.
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A normal trachea (windpipe) has many rings made of cartilage (a strong and flexible tissue). These rings are C-shaped and support the trachea but also allow it to move and flex when your child breathes. Complete tracheal rings are a birth defect in these rings that causes them to be O-shaped instead of C-shaped.
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The trachea is surrounded by 16 - 20 rings of hyaline cartilage; these 'rings' are 4mm high in the adult, incomplete and C-shaped. Ligaments connect the rings.
The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people.
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