Beginner External Auditory Canal Quiz

Q1. What does the external auditory canal connect?

• The mastoid antrum to the middle ear
• The middle ear to the nasopharynx
• The auricle to the tympanic membrane
• The cochlea to the vestibule

Q2. Approximately what proportion of the external auditory canal is cartilaginous?

• Lateral two-thirds
• Entire canal
• Medial one-third
• Lateral one-third

Q3. Approximately what proportion of the external auditory canal is bony?

• Lateral one-third
• Medial two-thirds
• Medial one-third
• Entire canal

Q4. Which bone forms most of the bony external auditory canal?

• Temporal bone
• Zygomatic bone
• Sphenoid bone
• Occipital bone

Q5. What structure forms the medial boundary of the external auditory canal?

• Tympanic membrane
• Auditory tube
• Oval window
• Round window

Q6. Which glands in the external auditory canal contribute to cerumen production?

• Lacrimal glands
• Ceruminous glands
• Sublingual glands
• Parotid glands

Q7. Where are hairs and ceruminous glands most prominent in the external auditory canal?

• Deep bony portion
• Tympanic cavity
• Cochlear duct
• Cartilaginous lateral portion

Q8. What is a major function of cerumen in the external auditory canal?

• Equalization of middle ear pressure
• Production of endolymph
• Transmission of ossicular vibrations
• Protection and trapping of debris

Q9. Which direction does sound travel through the external auditory canal?

• Toward the pharyngotympanic tube
• Toward the mastoid air cells
• Directly into the cochlear duct
• Toward the tympanic membrane

Q10. Which part of the ear contains the external auditory canal?

• Inner ear
• External ear
• Middle ear
• Auditory cortex