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Questions and Answers
What is auricular perichondritis?
What is auricular perichondritis?
- Infection of the auricular perichondrium (correct)
- Infection of the eardrum
- Infection of the ear canal
- Infection of the middle ear
What is the usual cause of auricular perichondritis?
What is the usual cause of auricular perichondritis?
- Klebsiella pneumoniae
- Escherichia coli
- Staphylococcus aureus
- Pseudomonas aeruginosa (correct)
What is affected in auricular perichondritis?
What is affected in auricular perichondritis?
- Cartilage
- Muscle
- Perichondrium (correct)
- Skin
What type of infection is auricular perichondritis?
What type of infection is auricular perichondritis?
What is the location of the infection in auricular perichondritis?
What is the location of the infection in auricular perichondritis?
What type of epithelium lines the structure?
What type of epithelium lines the structure?
What is a possible complication of this structure?
What is a possible complication of this structure?
What symptom may arise when this structure gets infected?
What symptom may arise when this structure gets infected?
What is the treatment for this structure when it is asymptomatic?
What is the treatment for this structure when it is asymptomatic?
When is excision of this structure required?
When is excision of this structure required?
What are the auricle and external auditory canal developed from?
What are the auricle and external auditory canal developed from?
What is the origin of the dorsal part of the 1st branchial cleft?
What is the origin of the dorsal part of the 1st branchial cleft?
What happens to the ventral part of the 1st branchial cleft in normal development?
What happens to the ventral part of the 1st branchial cleft in normal development?
What is a possible consequence of the ventral part of the 1st branchial cleft not disappearing?
What is a possible consequence of the ventral part of the 1st branchial cleft not disappearing?
How many tubercles contribute to the development of the auricle?
How many tubercles contribute to the development of the auricle?
In which patients is auricular perichondritis not infrequently fatal?
In which patients is auricular perichondritis not infrequently fatal?
Which group of patients is more likely to develop auricular perichondritis?
Which group of patients is more likely to develop auricular perichondritis?
What is a common characteristic of patients who are susceptible to auricular perichondritis?
What is a common characteristic of patients who are susceptible to auricular perichondritis?
Which of the following patients is at a higher risk of developing auricular perichondritis?
Which of the following patients is at a higher risk of developing auricular perichondritis?
What is a common factor among patients who are susceptible to auricular perichondritis?
What is a common factor among patients who are susceptible to auricular perichondritis?
What is a symptom of the acute stage of the disease?
What is a symptom of the acute stage of the disease?
What is a characteristic of the discharge in the chronic stage of the disease?
What is a characteristic of the discharge in the chronic stage of the disease?
Which of the following is NOT a symptom of the acute stage?
Which of the following is NOT a symptom of the acute stage?
What is a symptom of the chronic stage of the disease?
What is a symptom of the chronic stage of the disease?
What is a characteristic of the tympanic membrane in the acute stage of the disease?
What is a characteristic of the tympanic membrane in the acute stage of the disease?
Study Notes
Development of the Auricle
- The auricle is formed from six tubercles derived from the 1st and 2nd branchial arches.
- The dorsal part of the 1st branchial cleft gives rise to the external auditory canal.
- The ventral part of the 1st branchial cleft normally disappears, but can persist as a preauricular sinus, cyst, or collaural fistula.
Characteristics of the Auricle
- The auricle is lined by squamous epithelium.
- Infections of the auricle can lead to pain and pus discharge.
- Excision is required only when the auricle is symptomatic.
Auricular Perichondritis
- Definition: Infection of the auricular perichondrium, usually caused by Pseudomonas aeruginosa.
- Acute stage: Characterized by redness and swelling of the meatal skin, pus in the meatus, and redness of the tympanic membrane.
- Chronic stage: Characterized by deafness, purulent or serosanguinous discharge.
- High-risk groups: Elderly diabetic patients, immuno-suppressed patients (e.g. those with AIDS, leukemia, on steroids or chemotherapy, or renal failure).
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Description
This quiz covers the development of the auricle and external auditory canal from the 1st and 2nd branchial arches. Learn about the formation of preauricular sinus, cyst or collaural fistula.
