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30 Cards in this Set
- Front
- Back
What are the three parts of the external ear?
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Auricle
External auditory meatus Tympanic membrane |
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Define: the rim of auricle.
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Helix of auricle
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What is the curved part internal and parallel to the helix in the auricle?
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Antihelix
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Define: Opening of auricle leading to external auditory meatus
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Concha
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Define: Prominence at anterior border of concha
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tragus
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Define: Soft tissue forming the inferior part of auricle
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Lobule
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What are the GSA branches which supply the external ear?
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V
VII IX X |
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What part of the external auditory meatus is a wider portion with elastic cartilage covered by skin containing sebaceous, ceruminous (wax) glands and hair; provides sticky barrier to preent entrance of foreign bodies.
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Outer 1/3 of the canal
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What part of the external auditory meatus: narrow portion; consists of bone covered by skin without glands or hair.
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inner 2/3 of canal
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What is the innermost structure of the external auditory meatus?
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Tympanic membrane
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What are the three layers of the tympanic membrane?
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Outer = epithelium
Middle = fibrous tissue inner = mucousa |
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What is the small upper part of the tympanic membrane that is not secured in tymapnic sulcus and has no fibrous layer?
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pars flaccida
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What is the large, lower 4/5 that is secured in the tympanic sulcus; comprised of all three layers (tympanic membrane)?
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pars tensa
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What is attached to fibrous layer of mambrane and covered by mucosa; tip of it ends just below center of membrane and produces a depression called the umbo
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Handle of malleus
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What part of the tympanic membrane do you drain when it's abscessed?
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Lower pars tensa (not pars flaccida)
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What consists of a small narrow space in the temporal bone, medial to the tympanic membrane?
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The tympanic cavity proper
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What is the small space above the tympanic membrane called?
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Eiptympanic recess
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What are the four structures associated with the lateral wall of the middle ear cavity?
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Tympanic membrane
handle of malleus Chorda tympani nerve Epitympanic recess |
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Describe the relationship between the chorda tympani nerve and the handle of malleus & process of incus.
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It is medial to handle of malleus and lateral to process of incus
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What is the one structure associated with the roof of the middle ear cavity?
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The tegmen tympani
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What lies above the tegmen tympani?
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The meninges and temporal lobe
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What is the clinical significance of the tegmen tympani, the meninges and temporal lobe whihc lie above it?
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infection in the middle ear could spread which may produce meningits and/or temporal lobe abscess.
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What is the floor of the middle ear cavity composed of?
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The mastoid bone
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What nerve perforates the narrow floor of mastoid bone in the middle ear cavity?
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Tympanic branch of CN IX
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What structure is located below the floor of the middle ear cavity?
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The jugular fossa with the internal jugular vein
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What is the clinical significance of the jugular fossa located below the floor of the middle ear cavity.
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An infection in the middle ear cavity could result in thrombosis.
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What are the four structures associated with the anterior wall?
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The canal for tensor tympani
opening of the auditory tube Between the two oepning is a bony shelf called the processus cochleariformis Postganglionic fibers leave the ICA and pierce the wall |
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What is the pullery for the tendon of tensor tympani's insertion on the malleus?
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The processus cochleariformis
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What is between the two openings in the bony shelf?
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Processus cochleariformis
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What is the clinical significance lf the lamina of bone forming the inferior part of anterior wall of the tympanic cavity?
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It separates it from the carotid canal with the internal carotid artery and postganglionic sympathetic plexus if otits media infection involves this bony wall it could result in thrombosis of ICA.
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