Why do we hear?
Human survival in aggressive environmental conditions depends on how well his senses are developed. We derive information from the surrounding world through the six senses - the visual system, hearing organs, taste buds, smell, tactile sensation, and the vestibular apparatus. This article will discuss how our ears work and why we hear sounds around us.
The organ of hearing in humans is the ear - a paired organ located in the temporal bones of the skull. From the anatomical point of view, the ear consists of three parts, which will be discussed below.
This is what we used to call the ear in the classical, everyday sense, namely, the external auricle and the auditory canal from it. The auricle is an intricate cartilage that has skin, at the bottom of which there is a tight fold of fat and skin, called the ear lobe. Not many people know that they also have ear muscles. Some people can move their ears, but this skill does not have any practical application and is, in fact, an atavism.
The function of the auricle is to catch various sounds around.From it, the cartilage continues in the form of the ear canal, up to 30 mm long, which ends with the eardrum. After your ear has caught certain sound waves, they hit the eardrum and create a jitter, which is then transmitted to the middle ear.
The middle ear is the cavity behind the eardrum, in which the malleus, the incus and the stirrup are located - small auditory ossicles interconnected, reinforcing and transmitting the received sound vibrations to the inner ear. This cavity is connected to the nasopharynx by the Eustachian tube. This is necessary in order to be able to equalize the pressure on both sides of the eardrum.
The most complex and most important component of the organ of hearing is the inner ear. It has a very complex structure, which makes one think about a maze. First comes the so-called run-up, then the cochlea and the semicircular canals. The snail is responsible for the perception of sounds and consists of three channels filled with lymph. Directly the receptor part of the organ of hearing is located in the second channel and is called the organ of Corti.In addition, vestibular receptors are located in the inner ear.
The organs of hearing are very easily damaged, since hearing can deteriorate or disappear altogether, both as a result of mechanical damage, and as a result of various diseases and inflammations. At the moment, scientists and doctors have invented many special devices and devices designed to restore or artificially replace the lost ability to hear, but all of them are far from ideal.