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30 Cards in this Set

  • Front
  • Back
What are the three parts of the external ear?
Auricle
External auditory meatus
Tympanic membrane
Define: the rim of auricle.
Helix of auricle
What is the curved part internal and parallel to the helix in the auricle?
Antihelix
Define: Opening of auricle leading to external auditory meatus
Concha
Define: Prominence at anterior border of concha
tragus
Define: Soft tissue forming the inferior part of auricle
Lobule
What are the GSA branches which supply the external ear?
V
VII
IX
X
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.
Outer 1/3 of the canal
What part of the external auditory meatus: narrow portion; consists of bone covered by skin without glands or hair.
inner 2/3 of canal
What is the innermost structure of the external auditory meatus?
Tympanic membrane
What are the three layers of the tympanic membrane?
Outer = epithelium
Middle = fibrous tissue
inner = mucousa
What is the small upper part of the tympanic membrane that is not secured in tymapnic sulcus and has no fibrous layer?
pars flaccida
What is the large, lower 4/5 that is secured in the tympanic sulcus; comprised of all three layers (tympanic membrane)?
pars tensa
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
Handle of malleus
What part of the tympanic membrane do you drain when it's abscessed?
Lower pars tensa (not pars flaccida)
What consists of a small narrow space in the temporal bone, medial to the tympanic membrane?
The tympanic cavity proper
What is the small space above the tympanic membrane called?
Eiptympanic recess
What are the four structures associated with the lateral wall of the middle ear cavity?
Tympanic membrane
handle of malleus
Chorda tympani nerve
Epitympanic recess
Describe the relationship between the chorda tympani nerve and the handle of malleus & process of incus.
It is medial to handle of malleus and lateral to process of incus
What is the one structure associated with the roof of the middle ear cavity?
The tegmen tympani
What lies above the tegmen tympani?
The meninges and temporal lobe
What is the clinical significance of the tegmen tympani, the meninges and temporal lobe whihc lie above it?
infection in the middle ear could spread which may produce meningits and/or temporal lobe abscess.
What is the floor of the middle ear cavity composed of?
The mastoid bone
What nerve perforates the narrow floor of mastoid bone in the middle ear cavity?
Tympanic branch of CN IX
What structure is located below the floor of the middle ear cavity?
The jugular fossa with the internal jugular vein
What is the clinical significance of the jugular fossa located below the floor of the middle ear cavity.
An infection in the middle ear cavity could result in thrombosis.
What are the four structures associated with the anterior wall?
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
What is the pullery for the tendon of tensor tympani's insertion on the malleus?
The processus cochleariformis
What is between the two openings in the bony shelf?
Processus cochleariformis
What is the clinical significance lf the lamina of bone forming the inferior part of anterior wall of the tympanic cavity?
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.