Cross Section Of Cochlea

Look at the cross section of cochlea. Each coil of the cochlea has three chambers and three membranes. The upper chamber in the illustration is the scala vestibuli. It is connected to the oval window. The vestibular membrane is the tissue that forms the bottom of the scala vestibuli. Below this is the scala media that houses the spiral organ (or the organ of Corti). The bottom chamber is the scala tympani. Between the scala tympani and the scala media is the basilar membrane. Label these features and color each space (scala) a different color.

Spiral Organ

The scala media is the region of the cochlea involved in hearing. It is bounded by the vestibular membrane on top and the basilar membrane on the bottom. Attached to the basilar membrane are the hair cells. These cells are attached to the tectorial membrane which vibrates when sound impulses enter the cochlea. The tectorial membrane tugs on the hair cells which converts the sound impulse to a neural impulse which travels by the cochlear nerve to the brain where hearing is interpreted. Label these structures and color them in, each with a different color.

Vestibulocochlear nerve

Neural Impulses

Vestibulocochlear nerve

Hair Cells Your Hair

Answer Key: a. Scala vestibuli, b. Vestibular membrane, c. Scala media, d. Scala tympani, e. Basilar membrane, f. Hair cell, g. Tectorial membrane

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Essentials of Human Physiology

Essentials of Human Physiology

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