The ear is an organ of the body that is used for hearing and balance. It is connected to the brain by the auditory nerve and is composed of three divisions, the external ear, the middle ear, and the inner ear. The greater part of which is enclosed within the temporal bone.
The ear is looked upon as a miniature receiver, amplifier and signal-processing system. The structure of the outer ear catching sound waves as they move into the external auditory canal. The sound waves then hit the eardrum and the pressure of the air causes the drum to vibrate back and forth. When the eardrum vibrates its neighbour the malleus then vibrates too. The vibrations are then transmitted from the malleus to the incus and then to the stapes. Together the three bones increase the pressure which in turn pushes the membrane of the oval window in and out. This movement sets up fluid pressure waves in the perilymph of the cochlea. The bulging of the oval window then pushes on the perilymph of the scala vestibuli. From here the pressure waves are transmitted from the scala vestibuli to the scala tympani and then eventually finds its way to the round window. This causes the round window to bulge outward into the middle ear. The scala vestibuli and scala tympani walls are now deformed with the pressure waves and the vestibular membrane is also pushed back and forth creating pressure waves in the endolymph inside the cochlear duct. These waves then causes the membrane to vibrate, which in turn cause the hairs cells of the spiral organ to move against the tectorial membrane. The bending of the stereo cilia produces receptor potentials that in the end lead to the generation of nerve impulses.
The External or Outer Ear - comprises of the auricle or pinna which is the fleshy part of the outer ear. It is cup-shaped and collects and amplifies sound waves which then passes along the ear canal to the ear drum or tympanic membrane.
These vibrations are caught by the Outer part of the ear (Pinna). ... Once in the ear canal the tympani membrane (eardrum) vibrates. The eardrum is located between the middle ear and ear canal. ... This is known as ototoxicity which means ear poisoning. ... This first bionic ear was improved upon in 1982. ...
It is connected to the brain by the auditory nerve and is composed of three divisions, the external ear, the middle ear, and the inner ear. ... The External or Outer Ear - comprises of the auricle or pinna which is the fleshy part of the outer ear. ... These secrete ear wax or cerumen. ... The middle ear is separated from the outer ear by the eardrum and from the inner ear by a thin bony partition that contains two small membrane-covered openings. ... This allows the air to enter or leave the middle ear until the pressure in the middle ear equals the atmospheric pressure. ...
THE HUMAN EAR Hearing plays such an important role in everyday life of man. ... By the 15th century, the presence of the eardrum and two of the three bones of the middle ear had been recognised, but not much effort was put into further discovering the ear. ... Almost 300 years later then earlier discoveries Domenico Cotugno would find that, in contrast to the air filled middle ear, the inner ear is fluid-filled. ... Our understanding of how the ear works entered its most exciting phase about 20 years ago when it was discovered that the inner ear actually makes sounds. Our ears sense m...
The concept of the afterlife can be seen in many different perspectives. My opinion of the afterlife depends on how someone would have lived in life. If a human's occupation in life was a serial killer who was put to death because of your crimes that were commited and therefore would be sent to hea...
What is the difference between sensible beauty and the beauty of things outside the sense? Sensible beauty is just that: beauty perceived through the senses. Beauty outside the senses is the beauty seen when what is perceived by the senses is not taken into consideration. Plotinus said that anyo...
As we make our way to the biggest rivalry in town, I lie here on this torn wrinkly brown leather, with ear buds in my ear, my Letterman jacket just under my head, like a mothers arm holding her baby, and the words you've thrown at me really strike me. ... All of sudden, my ear buds fall out of my ear. ...
Ménière's disease is a disorder of the inner ear that causes vertig, ringing in the ears (tinnitus), sensorineural hearing loss, and a feeling of fullness in the ear. ... Constant attacks of Meniere's disease kills hair cells in the inner ear. ... Mechanical disruption of the inner ear is also likely to be damaged with dilation of the utricle and saccule of the ear. ... Injecting antibiotics into the middle ear helps control vertigo but also raises the risk of hearing loss because gentamicin can damage the microscopic hair cells in the inner ear that aid us in hearing. ...
Meniere's Disease is an illness that presents victims with hearing loss, pressure in the ear, tinnitus, severe imbalance, and vertigo. Vertigo is the most dramatic and distressing symptom of Meniere's - it is commonly caused by acute labyrinthitis (a viral inflammation of the inner ear), abnormally floating crystals in the inner ear that stimulate the nerve endings of the inner ear, or is the result of cervical spine problems. ... Other causes may include a middle ear infection or head injury. Eventually, the pressure and severe disruptions inside the inner ea...
