A cartilaginous structure is a type of connective tissue found in the body. The EAR is an example of a cartilaginous structure, which is made up of three parts: the outer EAR, the middle EAR, and the inner EAR. The outer EAR is composed of cartilage and skin, while the middle and inner EAR are made up of bones and membranes. The cartilage helps to protect the delicate structures of the EAR and also helps to amplify sound waves.