The Pharmaceutics and Compounding Laboratory
Otic Preparations

Introduction

The ear has three main sections: the outer ear, the middle ear, and the innner ear. The outer ear contains the external part of the ear as well as the part of the ear canal that leads up to the tympanic membrane. Cerumen (ear wax) is producted in the skin of the ear canal. It serves to lubricate the canal and extrap dust and foreign materials.

The middle ear contains the three ear bones or ossicles: the malleus, incus, and stapes. The middle ear also contains the Eustachian tube. The Eustachian tube functions to equalize pressure and allows mucus drainage.

The inner ear contains the cochlea which is the organ of hearing. The inner ear also contains three semi-circular canals and the bestibule which function to maintain balance.