The term 'of ears' can be broken down into two parts: OTIC (4 letters) and OTO (3 letters). OTIC is an adjective that means 'relating to the EAR or hearing, ' while OTO is a prefix meaning 'EAR.' Together, they form a phrase that refers to the anatomy of the EAR, which is composed of three main parts: the outer EAR, the middle EAR, and the inner EAR. The outer EAR consists of the pinna, the visible part of the EAR, and the auditory canal, which leads to the eardrum. The middle EAR contains the ossicles, three tiny bones that transmit sound vibrations from the eardrum to the inner EAR. The inner EAR is filled with fluid and contains the cochlea, which converts sound vibrations into nerve signals that are sent to the brain.