Advanced External Auditory Canal Quiz

Q1. Why can otitis externa be especially painful when inflammation involves the bony external auditory canal?

• The bony canal is lined by synovium
• The bony canal contains the organ of Corti
• Thin skin is tightly bound to sensitive periosteum in a confined space
• Inflammation directly stretches the cochlear nerve

Q2. Why can infection of the external auditory canal spread toward the parotid region?

• Cartilaginous fissures can provide pathways into adjacent soft tissues
• The auditory tube passes through the parotid gland
• The tympanic membrane contains a parotid duct
• The cochlear aqueduct opens into the parotid gland

Q3. Why can movement of the tragus or auricle worsen pain in otitis externa?

• It opens the round window
• It directly rotates the cochlea
• It contracts the stapedius muscle
• Manipulation moves inflamed canal skin and cartilage

Q4. Why should instruments be used cautiously in the medial external auditory canal?

• The internal carotid artery normally lies exposed in the canal
• The canal contains the auditory ossicles
• The thin bony-canal skin and nearby tympanic membrane are vulnerable to trauma
• The facial nerve runs freely on the canal skin

Q5. Why can impacted cerumen produce conductive hearing loss?

• It can mechanically block sound from reaching the tympanic membrane
• It interrupts the auditory cortex
• It destroys spiral ganglion neurons
• It prevents endolymph production

Q6. Why is the external auditory canal not uniformly glandular along its length?

• The medial canal is covered by cartilage containing glands
• All glands are restricted to the middle ear
• Glands and hair follicles are concentrated in the lateral cartilaginous portion
• The tympanic membrane produces all cerumen

Q7. Why can external auditory canal pathology cause referred or overlapping pain patterns?

• All canal sensation travels through the cochlear nerve
• It has no somatic sensory innervation
• It is innervated only by the optic nerve
• Its sensory innervation comes from multiple neural sources

Q8. Why can the external auditory canal be narrowed by inflammation more readily than a broad open skin surface?

• Swelling occurs within a confined tubular lumen
• The canal normally collapses because it has no supporting framework
• The canal is filled with endolymph
• The canal is enclosed entirely by muscle

Q9. Why is the relationship between the external auditory canal and tympanic membrane important during otoscopy?

• The tympanic membrane is located in the cochlea
• The tympanic membrane lies lateral to the auricle
• The tympanic membrane is parallel to the canal lumen throughout
• The tympanic membrane lies obliquely at the medial end of the canal

Q10. Which statement best integrates the anatomy of the external auditory canal?

• It is an entirely bony inner-ear tube containing the organ of Corti
• It combines cartilaginous and bony segments with specialized skin, sensory supply, and important regional relationships
• It is a middle-ear passage connecting directly to the nasopharynx
• It is a membranous labyrinth structure filled with endolymph