Sulcus spiralis

Sulcus spiralis is a structure found in the cochlea of the inner ear. It is a spiral groove that separates the scala vestibuli and the scala media. The sulcus spiralis is divided into two parts: the sulcus spiralis internus and the sulcus spiralis externus.

Structure

The sulcus spiralis is a spiral-shaped groove that runs along the cochlea. It is divided into two parts: the sulcus spiralis internus and the sulcus spiralis externus. The sulcus spiralis internus is located on the inner side of the cochlea, while the sulcus spiralis externus is located on the outer side.

The sulcus spiralis separates the scala vestibuli, which is filled with perilymph, from the scala media, which is filled with endolymph. This separation is important for the proper functioning of the cochlea, as it allows for the different fluids to interact in a way that enables the detection of sound.

Function

The primary function of the sulcus spiralis is to separate the scala vestibuli and the scala media. This separation allows for the different fluids in these two spaces to interact, which is crucial for the detection of sound.

When sound waves enter the ear, they cause the basilar membrane to vibrate. This vibration causes the perilymph in the scala vestibuli to move, which in turn causes the endolymph in the scala media to move. This movement of the endolymph stimulates the hair cells in the organ of Corti, which then send signals to the brain that are interpreted as sound.

Clinical significance

Damage to the sulcus spiralis can result in hearing loss. This can occur as a result of trauma, infection, or degenerative diseases such as Meniere's disease. Treatment for damage to the sulcus spiralis typically involves addressing the underlying cause of the damage.

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