Ear : Hearing is as important as vision. Our ear helps us in hearing and also to maintain the balance or equilibrium of our body. Main parts: Ear has three main parts i.e. external ear, middle ear, and internal ear. A- External Ear: External ear consists of pinna, auditory canal and ear drum (tympanum). Pinna is the broad external part, made of cartilage and covered with skin. It helps to direct sound waves into auditory canal. There are special glands in the walls of auditory canal , which produce wax. The wax and the hairs in auditory canal protect ear from small insects, germs and dust. In additions to this, they help to maintain the temperature and dampness of auditory canal. Auditory canal ends in ear drum . This t...