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19 Cards in this Set
- Front
- Back
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Structure of the ear |
The ear is divided into three major areas: external ear, middle ear, and internal ear. |
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External ear |
The external (outer) ear consists of the auricle and the external acoustic meatus. |
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Auricle (or pinna) |
The auricle, or pinna, is what most people call the ear. |
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External acoustic meatus |
The external acoustic meatus (auditory canal) is a short, curved tube that extends from the auricle to the eardrum. |
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Ceruminous glands |
These glands secrete yellow-brown waxy cerumen, or earwax (cere = wax), which provides a sticky trap for foreign bodies and repels insects. |
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Tympanic membrane |
Sound waves entering the external acoustic meatus eventually hit the tympanic membrane, or eardrum, the boundary between the outer and middle ears. |
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Middle air |
The middle ear, or tympanic cavity, is a small, air-filled, mucosa-lined cavity in the petrous portion of the temporal bone. |
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Auditory ossicles |
The tympanic cavity is spanned by the three smallest bones in the body: the auditory ossicles. These bones, named for their shape, are the malleus (hammer); the incus (anvil); and the stapes (stirrup). The "handle" of the malleus is secured to the eardrum. |
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Internal ear |
The internal is also called the labyrinth ("maze") because of its complicated shape. The internal ear has two major divisions: the bony labyrinth and the membranous labyrinth. |
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Semicircular canals |
The semicircular canals lie posterior and lateral to the vestibule, and each of these canals defines about two-thirds of a circle. |
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Cochlea |
The cochlea, from the Latin, "snail", is a spiral, conical, bony chamber about the size of a split pea. |
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The structure/s responsible for your sense of balance is/are the: |
Semicircular canals |
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The correct order of the following structures from the external acoustic meatus inwards is |
Malleus - Incus - Stapes |
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The auditory cortex is located in the: |
Temporal lobes |
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When the auditory ossicles vibrate, they push on the ................., creating pressure waves in the scala vestibuli. |
Oval window |
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The transmission of sound vibrations through the internal ear occurs chiefly through: |
Fluid |
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The transmission of sound vibrations through the internal ear occurs chiefly through: |
Fluid |
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Conduction of sound from the middle ear to the internal ear occurs via vibration of the: |
Stapes in the oval window |
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Semicircular canals function: |
Equilibrium, balance |
