Which fluid is found in the outer chamber of the inner ear?

The outer chamber of the inner ear, specifically the space known as the scala vestibuli and scala tympani, contains perilymph. This fluid plays a crucial role in the hearing process by transmitting sound vibrations from the oval window (where the stapes connects) to the cochlea. Perilymph is similar in composition to extracellular fluid and is important for maintaining the electrochemical gradients necessary for auditory transduction.

In contrast, endolymph is found in the inner chambers of the inner ear, particularly within the scala media (cochlear duct), and has a different ionic composition essential for sensory cell function. Cerebrospinal fluid is located surrounding the brain and spinal cord, providing cushioning and support, while synovial fluid is found in joint cavities and serves to lubricate and nourish the cartilage. Understanding the distinct locations and roles of these fluids is crucial for grasping the intricate anatomy and physiology of the ear.