what are the 3 divisions of the ear?
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['External or outer ear, consisting of: Pinna or auricle. This is the outside part of the ear. ... ', 'Tympanic membrane (eardrum). The tympanic membrane divides the external ear from the middle ear.', 'Middle ear (tympanic cavity), consisting of: Ossicles. ... ', 'Inner ear, consisting of: Cochlea.']
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The main vessels are the central ear artery and two lateral veins. The central ear artery runs towards the ear tip and bifurcates into two major branches showing a U-turn curve halfway up to the pinnae.
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At 3 mm x 2.5 mm, the "stapes" in the middle ear is the smallest named bone in the human body. The shape of a stirrup, this bone is one of three in the middle ear, collectively known as the ossicles.
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The Axial Skeleton The skeleton is subdivided into two major divisions—the axial and appendicular. The axial skeleton forms the vertical, central axis of the body and includes all bones of the head, neck, chest, and back (Figure 7.2).
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['Paranasal sinuses. Frontal sinuses. ... ', 'Auditory membranes. Tympanic membrane. ... ', 'Nasal mucosa.', 'Pharynx. Nasopharynx. ... ', 'Larynx. Laryngeal vestibule. ... ', 'Tracheobronchial tree. ... ', 'Lungs.']
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The component parts of the membranous labyrinth are the three semicircular ducts, each with a sense organ for rotational movement; the cochlear duct, with the sense organ for sound vibrations, and in the vestibule, the utricle and saccule, with their two sense organs for linear movement.
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The cavity also plays a very important role in a person's ability to hear. Inside the middle ear, three small bones (ossicles) form a chain and conduct sound vibrations from the eardrum to the inner ear. Once in the fluid-filled inner ear, sounds are converted into nerve impulses and sent to the brain.
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The outer ear is made up of cartilage and skin. There are three different parts to the outer ear; the tragus, helix and the lobule. The ear canal starts at the outer ear and ends at the ear drum. ... Under the skin the outer one third of the canal is cartilage and inner two thirds is bone.
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Inside of the middle ear are the smallest bones in the body–the auditory ossicles, or ear bones. By definition, these three bones are named after their shape: malleus (“hammer”), incus (anvil), and stapes (stirrup). ... The ossicles are situated in the middle ear and suspended by ligaments.
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Answer and Explanation: Each human ear has three bones known as ossicles; the malleus, incus, and stapes (also known by their shape as the hammer, anvil, and stirrup,...
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The brain. The auditory nerve connects the cochlea of the inner ear directly to the auditory cortex on both sides of the brain, where sound is processed. The auditory cortex is divided into three parts: Primary auditory cortex: This area is primarily responsible for the ability to hear.
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The ossicles are tiny bones in the middle ear, that form a chain connecting the ear drum (Tympanic membrane, TM) and the inner ear.
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Ossicles. The middle ear contains three tiny bones known as the ossicles: malleus, incus, and stapes. ... The ossicles are classically supposed to mechanically convert the vibrations of the eardrum into amplified pressure waves in the fluid of the cochlea (or inner ear), with a lever arm factor of 1.3.
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The ear canal (external acoustic meatus, external auditory meatus, EAM) is a pathway running from the outer ear to the middle ear. The adult human ear canal extends from the pinna to the eardrum and is about 2.5 centimetres (1 in) in length and 0.7 centimetres (0.3 in) in diameter.
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The stapes is the third of three tiny bones in the middle ear and the one closest to the inner ear. Because of its shape, it's sometimes called the stirrup.
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['The Nose.', 'Paranasal Sinuses.', 'Pharynx "nasopharynx"']
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The Eustachian tube has three primary functions: 1) ventilation of the middle ear so that ambient pressure and middle ear pressure are similar; 2) protection of the middle ear from reflux of nasopharyngeal secretions and bacterial flora; and 3) drainage of secretions from the middle ear into the nasopharynx.