This uniqueness makes the ear an important identifying feature in forensic investigations. The shape, size, and even the subtle contours of the ear are distinct for every individual. Just like fingerprints, each person has unique ear characteristics. Protecting our ears from excessive noise exposure and taking care of our overall ear health is crucial to preserving this remarkable gift of hearing. Hearing is a precious sense that allows us to enjoy music, engage in conversations, and experience the world around us. As the earwax gradually moves towards the opening of the ear, it carries away dirt, dust, and dead skin cells, keeping the ear clean and healthy. The ear canal produces cerumen, commonly known as earwax, which helps lubricate and protect the ear. The ear has a remarkable self-cleaning mechanism. ![]() This is why certain sounds can wake us up even when we’re in a deep sleep. While our brain filters out insignificant noises during sleep, it remains alert to important sounds, such as an alarm or a baby crying. Read also: 19 Cell Membrane Facts The Wonders of Cellular Boundaries The Ear Never Stops HearingĮven when we’re sleeping, our ears are constantly picking up sounds. Different parts of the cochlea are responsible for capturing specific frequencies, allowing us to hear everything from low rumbles to high-pitched melodies. The human ear can perceive sounds ranging from about 20 hertz (Hz) to 20,000 Hz. ![]() Our ears are remarkable in their ability to detect a wide range of sound frequencies. This information helps the brain coordinate balance and spatial orientation. Within the inner ear, there are structures called semicircular canals that detect changes in head position and movement. Ears Play a Vital Role in Maintaining BalanceĪpart from hearing, the inner ear is also essential for maintaining balance. The inner ear houses the cochlea, which is responsible for converting sound vibrations into electrical signals that the brain can interpret. The middle ear contains the eardrum (tympanic membrane) and three small bones called the ossicles. The outer ear includes the visible part of the ear (pinna) and the ear canal. The mechanisms described above become obvious when one studies the transference function of the ME, ie the complex interaction between amplitude and phase that exists between the acoustic pressure at the entrance to the inner ear (Pv: pressure within the perilymph at the base of the scala vestibuli) and the pressure at the TM (Pt): Pv/Pt.The human ear is divided into three main parts: the outer ear, middle ear, and inner ear. ![]() ![]() More about physics (s ee below) Middle Ear transfer function In effect, ME function (similar to any type of mechanical system) depends on the friction (R) of the ossicular joints, the mass of the drum/ ossicular chain, and the rigidity (K) of the various membranes, ligaments, air volume and so on. Because of the relationship between the surface areas of the TM (area S1 = 0.6 cm2) and the stapes footplate (area S2 = 0.03 cm2), and because of the interaction of the ME levers (the axis of the ossicular chain passes very close to the incudomalleolar joint, but the two arms of this lever are of unequal length, d1/d2 = ~ 1.3), the pressure amplification is theoretically in the order of x26 (approx 28 dB)īeware, however! This calculation must be used with caution, because, due to its mechanical characteristics, the behaviour and the efficiency of the ME varies greatly with varying frequency of sound (f).
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