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Ch. 8 Special Senses
Marieb - Essentials of Human Anatomy & Physiology 13th Edition
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340Not the one you use?Change textbook
All textbooksMarieb 13th EditionCh. 8 Special SensesProblem 17
Chapter 8, Problem 17

Sound waves hitting the eardrum set it into motion. Trace the pathway of vibrations from the eardrum to the spiral organ of Corti, where the hair cells are stimulated.

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The sound waves cause the eardrum (tympanic membrane) to vibrate. These vibrations correspond to the frequency and amplitude of the sound waves.
The vibrations are transmitted to the auditory ossicles in the middle ear: the malleus (hammer), incus (anvil), and stapes (stirrup). These bones amplify the vibrations and transfer them to the oval window of the cochlea.
The stapes pushes against the oval window, creating pressure waves in the perilymph fluid within the cochlea. These waves travel through the scala vestibuli, one of the fluid-filled chambers of the cochlea.
The pressure waves in the perilymph cause the basilar membrane to vibrate at specific locations depending on the frequency of the sound. High-frequency sounds vibrate the basilar membrane near the base of the cochlea, while low-frequency sounds vibrate it near the apex.
The vibrations of the basilar membrane stimulate the hair cells located in the spiral organ of Corti. The hair cells convert mechanical vibrations into electrical signals, which are then transmitted to the brain via the auditory nerve (cranial nerve VIII).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Sound Wave Transmission

Sound waves are mechanical vibrations that travel through a medium, such as air, and are captured by the outer ear. When these waves reach the eardrum, they cause it to vibrate, initiating the process of sound transmission through the auditory system.
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Middle Ear Structures

The middle ear contains three small bones known as the ossicles (malleus, incus, and stapes) that amplify and transmit the vibrations from the eardrum to the inner ear. The stapes connects to the oval window, a membrane-covered opening to the cochlea, facilitating the transfer of sound energy into fluid.
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Organ of Corti and Hair Cells

The Organ of Corti, located within the cochlea, is the sensory organ responsible for converting sound vibrations into neural signals. It contains hair cells that, when stimulated by fluid movement caused by the vibrations, generate electrical impulses sent to the brain, allowing for the perception of sound.
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Related Practice
Textbook Question

Sounds entering the external acoustic meatus are eventually converted to nerve impulses via a chain of events including:

a. Vibration of the eardrum

b. Vibratory motion of the ossicles against the oval window

c. Stimulation of hair cells in the spiral organ of Corti

d. Resonance of the cupula

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Textbook Question

Normal balance depends on information transmitted from a number of sensory receptor types. Name at least three of these receptors.

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Textbook Question

Name the structures of the outer, middle, and inner ears, and give the general function of each structure and each group of structures.

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Textbook Question

Movement of which structure triggers the bending of hairs of the hair cells in the spiral organ of Corti?

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Textbook Question

For each of the following descriptions, indicate whether it applies to a macula or a crista ampullaris: inside a semicircular canal; contains otoliths; responds to linear acceleration and deceleration; has a cupula; responds to rotational acceleration and deceleration; inside the vestibule.

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Textbook Question

Sylvia Marcus, age 70, recently had surgery for otosclerosis. The operation was a failure and did not improve her condition. What was the purpose of the surgery, and exactly what was it trying to accomplish?

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