Ear

The ear is the organ of hearing that allows us to record audio. This comes oscillations of solids and spreading sound wave. Soundwave in humans causes auditory perception. The height of the resulting tone determines the sound frequency, ie the number of oscillations per second. The higher this frequency is faster, the higher is also the resulting tone. Tones of large wavelength; they have a low frequency and vice versa. The human ear can distinguish tones at frequencies from 16 to 20,000 Hz. On the final extent affects mainly old man. Older people, for example, higher frequency tones can no longer hear.

construction ear

The external ear (auris externa)

We find in it the following three parts:

  • pinna (auricula) – Beginning ear. It consists of elastic cartilage-shell
  • external auditory canal (meatus External acustic) – 2.5 cm long tube, also called an audio channel. It consists of the cartilaginous and bone parts. On its surface hairs with sebaceous glands that produce earwax, ear serving as protection against harmful influences from outside. External auditory function is to capture audio and send it further inside the ear.
  • eardrum (tympanum) – a thin fibrous membrane that forms the boundary between the outer and middle ear. Under the action of the pressure waves of sound vibrates, noise amplifies and transmits it further to the middle ear

Middle ear (cavum Timpani)

The so-called middle ear cavity, the system of air-filled cavities on the surface of the mucosa. Stored in the temporal bone through the Eustachian tube and is connected to the nasopharynx. Is made up of three tiny bones in correspondence with the drum – hammer (malleus), anvil (incus) and the stirrup (stapes). These bones amplified vibrations to thirty and transfers it to the fluid of the inner ear. From the sound goes to the membrane of the oval window of the inner ear.

The inner ear (auris interna)

It is stored in the bony labyrinth temporal bone. It consists of three semicircular canals and pouches. Completed is fluid, perilymph, which floats membranous labyrinth (cochlea). Snail (cochlea) further comprises the organ of Corti with the amount of hair cells. Endolymph is completed.Vibrations of the oval window that vibrated fluid, the fluid then shakes the hair cells and they finally transmits signals to the brain that we perceive as sound.

Statokinetic function of the ear

The ear is not only the perception of sound. An important function is performed also in determining position and movement of the body in space.For this purpose the vestibular apparatus of the inner ear. Specifically, to detect the position of the body is in two bags filled with endolymph, to detect motion, the three semicircular canals.

ear disorders

Linking the middle ear with the nasopharynx by the Eustachian tube caused mainly by children frequent otitis media. It can also cause ringing in the ears. In connection with the vestibular mechanism occurs kinetózám, the most famous being seasick.

Sicknesses of this body part:

Inflammation of the ear canal

Inflammation of the ear canal

Description otitis Inflammation of the ear canal is painful ear disease. For clarification, a little basic anatomy of the ear, outer ear(pinna) goes into the “hole”, which is called the outer ear canal.External auditory canal leads to the eardrum –…

Inflammation of the middle ear

Inflammation of the middle ear

Description of otitis media Otitis media or otitis is one of the most common childhood diseases. Ear aches, fever until fever and usually leads to visit the emergency room (because it breaks out mostly at night, and its progress is…

Otosclerosis

Otosclerosis

Description of otosclerosis Otosclerosis is a degenerative disease affecting the bony labyrinth of the inner ear. There is a reconstruction of the bony portion of the inner ear and consequently to damage and loss of hearing. To understand the nature…

Meniere’s disease

Meniere’s disease

Description of Meniere’s disease Meniere’s disease is a disease of hearing and equilibrium organ (statoakustický), namely a part which is positioned in the inner ear. This disease affects men and women equally, most commonly between the 20th-50th year. Usually affects…

Motion sickness

Motion sickness

Description of motion sickness Motion sickness or motion sickness is not a disease, onlydiscomfort. It can arise from any other method of transfer of the body from one place before or during walking – these movements are people from the…