In which part of the cochlea do you find the highest concentration of endolymph?

The scala media is the part of the cochlea that contains the highest concentration of endolymph. This fluid is essential for the functioning of hair cells within the cochlea, which are responsible for converting sound vibrations into neural signals that are sent to the brain. The unique ionic composition of endolymph, characterized by high levels of potassium ions, creates a rich environment necessary for generating the electrical signals required for hearing.

In contrast, the scala vestibuli and scala tympani are filled with perilymph, a fluid that has a different ionic composition, and is not involved in the direct stimulation of hair cells. The cochlear nucleus, mentioned in another option, is part of the auditory pathway located in the brainstem and is not a physical component of the cochlea. Understanding the specific location and role of endolymph in hearing is crucial for recognizing how sound is processed by the auditory system.