The ear is divided into outer, middle, and inner regions with associated structures modified for sound perception.

In addition, receptors for the senses of balance and spatial orientation comprise the vestibular apparatus which is a part of the inner ear.

Learning objectives for the ear:

• Understand the overall organization of the ear, and the major components of the middle and inner ear regions.
• Understand the location and structure of the cochlea and its compartments and the location and formation of endolymph.
• Recognize and understand the function of hair cells in the cochlear organ of Corti and the vestibular portions of the inner ear.

Let's now look at some particulars of the eye.