Noise and Hearing Conservation Program (소음과 청력보존 프로그램) - 3 ◈ Anatomy and Physiology of the Ear (귀의 구조 및 생리학) There are three major parts of the ear. ① outer ear(외이), ② middle ear(중이), ③ inner ear(내이) outer ear (외이): Designed to collect sound vibrations & consists of the pinna. (소리의 진동을 모아 주는 역할) middle ear (중이): Transmits mechanical vibrations from the air into vibrations in fluid. (공기의 기계적 진동을 ..