what are these 'incomplete cartilagenous rings' that support the trachae, bronchi and bronchioles? is there any special name for them?

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No, there is no special name for the incomplete cartilaginous rings present in trachea, bronchi and bronchioles. They are sometimes referred to as C-shaped. They are called so because they are not complete rings giving them appearance of the letter 'C '. They are made up of bone like structure called cartilage (connective tissue).