What fluid is found in the scala vestibuli?

What fluid is found in the scala vestibuli?

• A. Perilymph
• B. Endolymph
• C. Cerebrospinal fluid
• D. Aqueous humor

Answer: (A)

Fluid in the scala vestibuli is perilymph. The cochlea contains three fluid-filled compartments: the scala vestibuli and scala tympani are filled with perilymph, while the scala media (cochlear duct) is filled with endolymph. Perilymph resembles extracellular fluid and has a relatively low potassium concentration, and it is continuous with cerebrospinal fluid via the cochlear aqueduct. When sound moves the stapes at the oval window, pressure waves travel through the perilymph of the scala vestibuli, propagate to the apex, and then through the scala tympani to move the basilar membrane. This mechanical stimulus is what hair cells transduce into neural signals. Endolymph, by contrast, fills the scala media and has a high potassium content, which is crucial for hair cell receptor potentials, while cerebrospinal fluid and aqueous humor are located in other parts of the nervous system and eye, respectively.

Fluid in the scala vestibuli is perilymph. The cochlea contains three fluid-filled compartments: the scala vestibuli and scala tympani are filled with perilymph, while the scala media (cochlear duct) is filled with endolymph. Perilymph resembles extracellular fluid and has a relatively low potassium concentration, and it is continuous with cerebrospinal fluid via the cochlear aqueduct. When sound moves the stapes at the oval window, pressure waves travel through the perilymph of the scala vestibuli, propagate to the apex, and then through the scala tympani to move the basilar membrane. This mechanical stimulus is what hair cells transduce into neural signals. Endolymph, by contrast, fills the scala media and has a high potassium content, which is crucial for hair cell receptor potentials, while cerebrospinal fluid and aqueous humor are located in other parts of the nervous system and eye, respectively.