Term
| What are the basic components of the outer ear? |
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Definition
Auricle or Pinna
External Auditory Meatus
Tympanic Membrane |
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Term
| What is the function of the Middle Ear? |
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Definition
| Transmits sound waves from the tympanic membrane to the inner ear. |
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Term
| What are the components of the Middle Ear? |
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Definition
Tympanic Cavity
Auditory or Eustachian Tube
Auditory Ossicles (Incus, Malleus, Stapes)
Oval and Round Windows |
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Term
| What are the components of the Inner Ear? |
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Definition
Bony Labrynth
Vestibule, Semicircular Canals, Cochlea
Membranous Labrynth
Utricle, Saccule, Semicircular Ducts, Cochlear Duct, Maculae, Cristae, and Organ of Corti |
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Term
| T/F: The ear is derived from all 3 embryonic germ layers. |
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Definition
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Term
| From what does the inner ear develop from? |
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Definition
| Otic or Auditory Vesicle, which forms from invaginations of the ectoderm |
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Term
| What do convolutions of the otic vesicle form? |
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Definition
| Divisions of the membranous labyrinth |
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Term
| What bone envelops the inner ear? |
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Definition
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Term
| What contributes to the lining of the middle ear? |
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Definition
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Term
| Where are cerminous glands located? |
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Definition
| They are located in the External Auditory Meatus and produce earwax. |
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Term
| T/F: The tympanic membrane is covered with a thin epidermis on its external surface. |
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Definition
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Term
| What bone surrounds the middle ear? |
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Definition
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Term
| T/F: The middle ear is a fluid filled cavity. |
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Definition
| False. The middle ear is an air filled cavity. |
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Term
| What type of epithelium lines the middle ear? |
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Definition
| Simple Squamous that becomes ciliated pseudostratified columnar as it lines the Auditory or Eustacian Tube |
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Term
| What connects the Tympanic Cavity to the Nasopharynx? |
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Definition
| Auditory or Eustacian Tube |
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Term
| What separates the middle ear from the inner ear? |
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Definition
| Oval and Round Windows, which are two small membranes |
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Term
| What division of the ear contains the auditory ossicles? What are they? |
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Definition
| Located in the middle ear, the auditory ossicles are the incus, malleus, and stapes. They transmit vibrations from the eardrum to the inner ear. |
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Term
| What are the two muscles that control vibrations of the ossicles? |
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Definition
| Stapedius and Tensor Tympani |
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Term
| What portion of the ear houses the sesorineural apparatus for hearing and equilibrium? |
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Definition
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Term
| What is the bony labyrinth? |
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Definition
| The fluid filled inner ear space within the temporal bone. |
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Term
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Definition
| The fluid in the inner ear |
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Term
| What is the bony labyrinth divided into? |
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Definition
Vestibule - central cavity
Three Semi-Circular Canals
Cochlea |
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Term
| Where is the Membranous Labyrinth? |
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Definition
| It is suspended in the Bony Labyrinth |
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Term
| What fluid fills the Membranous Labyrinth? |
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Definition
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Term
| What are the divisons of the Membranous Labyrinth? |
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Definition
Saccule and Utricle (Vestibule)
Semi-Circular Ducts (Semi-Circular Canals)
Cochlear Duct (Cochlea) |
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Term
| What are Hair Cells in the Ear? |
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Definition
| Specialized cells in the membranous labyrinth with ciliated apical surfaces. |
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Term
| What is the physiological principle underlying sensorineural transduction in the inner ear? |
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Definition
| Hair movements either hyperpolarize or depolarize cells leading to changes in neurosecretion |
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Term
| What feature in the Organ of Corti allows the ability to distinguish different frequencies of sound? |
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Definition
| Basilar Membrane, which is differentially sensitive to frequencies of vibration along its length. |
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Term
1. What is the function of the Macula?
2. Where is it located?
3. What membrane is associated with it which allows its function? |
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Definition
1. Responds to changes in linear acceleration.
2. Contained in the Saccule and Utricle of the Membranous Labyrinth
3. Otolithic Membrane
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Term
1. What is the function of the Crista Ampullaris?
2. Where is it located?
3. What membrane is associated with it which allows its function? |
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Definition
1. Responds to changes in angular momentum.
2. Contained within each of the ampullae of the Semi-Circular Ducts
3. Cupula, that moves with flow of endolymph |
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Term
1. What is the function of the Organ of Corti?
2. Where is it located?
3. What membrane is associated with it which allows its function? |
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Definition
1. Responds to sound waves
2. Contained within the cochlear duct
3. Tectorial Membrane |
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