![]() This is very useful, for instance, on take off and landing in a plane. The Eustachian tube (seen on the drawing above) links the middle ear cavity to the pharynx, allowing an equal pressure on both sides of the eardrum. A similar transfer of force can be seen with a drawing pin: when you press on the head of a drawing pin, the point can easily be pushed into the wall! As the eardrum is 20 times bigger than the oval window, which closes off the cochlea, this increases the force of the vibrations to allow them to pass to the liquid of the cochlea. It transfer sound waves from the ear to the fluid of the cochlea. It picks up, amplifies et focalises sounds toward the middle ear. Ossicles and Their Function Malleus (commonly known as the hammer) Incus (commonly known as the anvil) Stapes (commonly known as the footplate, or stirrup). External and Middle Ears realise the sound transfer This option is the first option of the given alternatives.What is the role of each partThe outer ear collects sound waves and directs them into the ear canal. Over the cochlea we can see the vestibule, which is the second sensory organ of the inner ear. The correct order in which sound waves travel through the ear is: Outer Ear, Eardrum, Hammer/Anvil/Stirrup, Cochlea. The hearing part of the inner ear is rolled up into a spiral called the cochlea, as it looks like a snail shell (‘cochlea’ is the greek word for snail). The ear lobe forms part of the outer ear which helps to funnel sound into the middle ear, which consists of three small bones, the hammer (malleus), anvil (incus), and stirrup (stapes), all mechanically coupled together (Figure 5.1). In the middle ear (m orange), the eardrum is mechanically linked by a chain of three tiny bones (the ossicles) to another membrane (the oval window) which closes the inner ear (i red). The anatomical structures of the human ear involved in hearing consist of the outer, middle, and inner ear. Together they form a short chain that crosses the middle ear and transmits vibrations caused by sound waves from the eardrum membrane to the liquid of the inner ear. The outer or external ear (e blue) is composed of the pinna (the visible part!) and the ear canal. Other articles where incus is discussed: ear bone: the malleus, or hammer, the incus, or anvil, and the stapes, or stirrup.
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