Beginner External Auditory Canal Quiz

Q1. What does the external auditory canal connect?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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