Final answer:
The fluid in the scala media of the inner ear is called endolymph.
Step-by-step explanation:
The fluid in the scala media of the inner ear is called endolymph. It is a fluid that is rich in potassium and low in sodium. The endolymph is important for transmitting sound vibrations within the cochlea and for stimulating the hair cells that are responsible for converting sound into electrical signals sent to the brain.