The endolymph within the scala media originates from cerebrospinal fluid (CSF) and is secreted by the stria vascularis, which is a network of capillaries located in the spiral ligament. The scala vestibuli and scala tympani both contain perilymph and surround the scala media, which contains endolymph. The cochlea contains three distinct anatomic compartments: the scala vestibuli, scala media (also referred to as the cochlear duct), and scala tympani. The cochlea is a spiral-shaped fluid-filled organ located within the cochlear duct of the inner ear. The membranous labyrinth contains a fluid known as endolymph, which plays a vital role in the excitation of hair cells responsible for sound and vestibular transmission. These organs make up the membranous labyrinth that is within the bony labyrinth, separated only by perilymph. The inner ear is located within the bony labyrinth of the temporal bone and contains the cochlea, semicircular canals, utricle, and saccule. Vibrations are transmitted from the malleus through the incus to the stapes, which is in contact with the cochlear oval window. The middle ear is an air-filled space that contains the three ossicles (malleus, incus, and stapes), which are bones responsible for transmitting vibrations from the tympanic membrane to the inner ear. The outer ear consists of the pinna, external auditory canal, and tympanic membrane and is responsible for the transmission of sound waves from the external environment. The ear is organized into three different anatomical structures: the outer, middle, and inner ear.
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