NeuroscienceLesson 4 of 5 in the course Sensory Systems

Sound Transmission, Cochlear Hearing, and Vestibular Sensing

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Hearing begins with sound waves and the structures that collect and conduct them. This lesson introduces the physical properties of sound and traces how vibrations travel through the outer and middle ear toward the inner ear.

Sound is a mechanical pressure wave: it travels when particles in a medium, such as air or water, vibrate and pass energy along. Sound cannot travel through a vacuum because a vacuum has no particles to carry the wave. The speed of sound depends on the medium and conditions such as temperature and altitude. In air at sea level and 20°C, it travels at about 343 meters per second.

All flashcards

What is sound?
A mechanical pressure wave that transfers energy through vibrating particles in a medium.
What is the function of the auditory ossicles?
The malleus, incus, and stapes conduct and amplify vibrations toward the inner ear.
What does place theory explain in hearing?
Pitch is identified in part by where the basilar membrane is stimulated most.
How do inner and outer cochlear hair cells differ?
Inner hair cells provide most auditory input; outer hair cells fine-tune cochlear responses.
What do the utricle and saccule detect?
Head tilt and linear acceleration, including the effects of gravity.

Quiz questions

  1. Why can sound not travel through a vacuum?Answer: A vacuum has no particles to carry a mechanical pressure wave.
  2. According to place theory, what helps the auditory system distinguish pitch?Answer: The location of greatest stimulation along the basilar membrane.
  3. Which cochlear hair cells provide most auditory information to the brain?Answer: Inner hair cells
  4. Which movement is primarily detected by the utricle and saccule?Answer: Linear acceleration and changes in head tilt.
  5. What kind of head movement do the semicircular canals detect?Answer: Changes in angular velocity, such as starting or stopping a turn.

Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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