Hearing Aid Apprentice Exam Review Study Guide

Hearing Aid Apprentice Exam Review
Study Guide

Anatomy & Physiology of the Ear

Outer Ear Structures

 Auricle is the outer visible part of the ear

 Helix (Pinna) is the upper ridge of the ear

 Antihelix is the inner ridge parallel to the helix

 Crus of Helix is where the upper ridge turns downward

 Concha (Bowl) is located just before entering the ear canal

Middle Ear Components

 Round Window attaches to stapes and moves fluid in cochlea

 Oval Window is located at the other end of the cochlea

 Incus, Malleus & Stapes are the 3 smallest bones in the body

 Eustachian Tube drains middle ear to throat and equalizes air pressure

 Tympanic Membrane (Eardrum) and Umbo (center of eardrum)

Inner Ear Structures

 Scala Tympani and Scala Vestibuli are cochlear ducts filled with fluids

 Scala Media is the 3rd duct in the cochlea filled with Endolymphatic Fluid

 Organ of Corti contains hair cells that generate nerve impulses from sounds

 Cochlear Nerve sends nerve impulses from the cochlea to the brainstem

 Vestibular Canals are fluid-filled canals for body's balance mechanism

Functions of Hearing Aids

Types of Hearing Aids

 ITE/in-the-ear and BTE/behind-the-ear styles