The mastoid is a bony elevation located behind and a little below the ear. It is made up of bony air cells, and its triangular shape makes it project prominently. In early life there may be only one air cell; but as a per son grows older, more cells develop and the mastoid becomes more prominent.
These cells, similar to hollowed out areas in the bone, communicate with the cavity of the middle ear. It is this easy communication between the mastoid cells and the cavity of the ear which may lead to trouble when infection develops after an earache.
