The structure in the inner ear that contains balance receptors and endolymph is called the:

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Question restatement: The structure in the inner ear that contains balance receptors and endolymph is called the:

Option 1: semicircular canals
- This is the correct choice. The semicircular canals are part of the vestibular system in the inner ear and house balance receptors (hair cells) within the ampullae of each canal. They are filled with endolymph, which moves when the head turns and helps detect angular acceleration, contributing to the sense of balance.

Option 2: pinna
- The pinna is the visible outer part of the ear (the auricle). It collects sound waves and helps funnel them into the ear canal, but it is not part of the inner ear and does not contain balance receptors or endolymph.

Option 3: tympanic membrane
- Also known as the eardrum, the tympanic membrane is located in the middle ear. It vibrates in response to sound waves and transmits those vibrations to the ossicles. It does not contain balance receptors or endolymph and is not part of the inner ear’s balance apparatus.

Option 4: cochlea
- The cochlea is a spiral-shaped organ in the inner ear responsible for hearing. It houses the organ of Corti and hair cells that transduce sound vibrations into neural signals. Although the cochlea contains endolymph, its primary role is hearing, not balance, so it does not fulfill the description of containing balance receptors as its main function.

In summary, the semicircular canals uniquely combine balancing receptors with endolymph in the inner ear, aligning with the question’s description, while the other structures serve different auditory or outer/middle-ear roles.

hk_264_120258_248438 Chapter 7 Self Test: Nervous System and Special Senses

The structure in the inner ear that contains balance receptors and endolymph is called the:

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