AST Surgical Technologist Practice Exam

What is the name of the spiral, conical structure within the inner ear?

1. Vestibule

2. Semicircular canals

3. Cochlea

4. Auditory canal

The correct answer is: Cochlea

The cochlea is the correct answer because it is specifically designed as a spiral, conical structure found within the inner ear. Its unique shape plays a crucial role in the auditory system by converting sound wave vibrations into neural signals. The cochlea contains the organ of Corti, which is lined with hair cells that detect sound vibrations and facilitate hearing. This intricate design allows for the differentiation of various frequencies and intensities of sound, making it essential for normal hearing function. The vestibule and semicircular canals, although part of the inner ear, serve different functions. The vestibule is involved primarily in balance and spatial orientation, detecting changes in head position, and the semicircular canals help maintain balance by sensing rotational movements. The auditory canal, on the other hand, is part of the outer ear and serves to transmit sound waves from the external environment to the eardrum. Thus, while all these structures are integral to the ear's function, the cochlea is distinctly identified as the spiral, conical component responsible for hearing.