Essentials of Otolaryngology
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each of the black spaces below before clicking
on it to display the answer.
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| External ear | consists of the auricle and the external auditory canal
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| What is the auricle composed of | except for the lobule, the auricle is composed of elastic cartliage and skin
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| How is the auricle attached to the head? | by the external auditory canal and several small muscles innervated by the facial nerve
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| Innervated | Supply (an organ or other body part) with nerves.
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| External Auditory Canal | cartilaginous in the lateral third and bony in the inner two-thirds
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| Cartilaginous portion of the skin contains... | hair follicles, sebaceous glands, and cerumen glands
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| What provides potential pathways for the spead of tumor and infection from the canal into the parotid gland? | Small dehiscences in the anterior portion of the cartilaginous external auditory canal.
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| Dehiscences | the release of materials by the splitting open of an organ or tissue.
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| What are the borders of the external ear canal? | The temporal lobe superiorly, mastoid posteriorly, TMJ and parotid gland anteriorly, and the TM medially.
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| What recieves it's blood supply from the superficial temporal and posterior auricular branches of the external carotid artery? | aurticle and external auditory canal
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| An air-containing space with bony walls except for the TM laterally. | middle ear
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| In the middle ear, what leads downward and medially to the nasopharynx? | eustacian tube
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