The cochlea (inner ear) — structure and function of the body

What is the cochlea of the inner ear?

The human ear is a unique organ, not only in structure, but the functions they perform. So, he perceives sound vibrations, responsible for maintaining equilibrium and has the ability to keep the body in space in a certain position.

Each of these functions is performed in one of three divisions of the ear: external, middle and inner. Then we will talk about the domestic Department, and more specifically about one of its component – the cochlea of the ear.

The structure of the cochlea of the inner ear

The structure of the inner ear represented by a maze of bony capsule and the membranous formation, which repeats the form of this capsule.

The bony labyrinth consists of the following departments:

  • semicircular canals;
  • threshold;
  • snail.

The cochlea in the ear is a bony formation, which has the form of a volume coil 2.5 turns around a bony core. The width of the base of the cone snails is 9 mm and the height is 5 mm. In length of the same bone spiral 32mm.

Help. The ear consists of the cochlea and relatively durable material, according to some scholars, this material is one of the most durable throughout the human body.

Since its way in the bone core, spiral plate goes inside the maze. This education at the beginning of the cochlea is wide, and closer to its completion gradually begins to narrow. Plate all speckled with channels, which are located in the dendrites of bipolar neurons.

Thanks primary (basilar) membrane, located between the untapped edge of the plate and the wall of the cavity, there is a division of cochlear canal 2 moves or steps:

  1. The upper passage or staircase of the vestibule — originates at the oval window and extends up to the apical point of the cochlea.
  2. The lower channel or tympani — extends from the apical point of the cochlea up to the round window.
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Both channels in the top of the cochlea are connected by a narrow hole – helicotrema. Both cavities are filled with perilymph, which is similar to cerebrospinal fluid.

Vestibular (rasprava) membrane separates the upper channel 2 cavities:

  • the ladder;
  • the membranous canal, called the cochlear duct.

In the cochlear duct on the basilar membrane is the organ of Corti – sound analyzer. It is composed of a support and the auditory receptor hair cells, above which is a covering membrane, to resemble a jelly-like mass.

The function of the cochlea of the inner ear

The main function of the cochlea in the ear is the transmission of nerve impulses coming from the middle ear to the brain, while the organ of Corti is a very important link in the chain, since it starts on the primary formation of analysis of audio signals. What is the sequence of performing such functions?

So, when sound waves reach the ear, they hit the membrane of the eardrum, thereby causing vibration in it. Further, the vibration reaches the 3 auditory ossicles (hammer, anvil, stapes).

Connected to the cochlea the stapes has an impact on the liquid in the fields: the stairs of the vestibule and the drum ladder. The liquid has an impact on the basilar membrane, which includes the auditory nerves, and creates her vibrational waves.

From the educated vibratory waves the cilia of the hair cells in the analyzer of sounds (the organ of Corti) are set in motion, irritating plate located above them like the canopy (the covering membrane).

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Then this process corresponds to the final stage where the hair cells transmit the impulse on the characteristics of the sounds to the brain. The latter as a complex logical processor proceeds to the separation of the useful sound signals from background noise, distributing them in groups according to various characteristics and looking at the memory of similar images.

Summing up the foregoing, it can be noted that the structure of the inner ear is a very complex system, where each component is responsible for a specific function.

Due to the fact that the snail is part of the ear, and more specifically in its internal Department, we can fully enjoy the variety of sounds, which is so rich in our world.