Sulcus spiralis externus

Sulcus Spiralis Externus

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Diagram of the cochlea showing the sulcus spiralis externus

The sulcus spiralis externus is a groove located in the cochlea of the inner ear. It plays a crucial role in the auditory system by contributing to the structure and function of the organ of Corti, which is essential for hearing.

Anatomy

The sulcus spiralis externus is situated on the outer wall of the cochlear duct, adjacent to the stria vascularis. It is part of the spiral ligament, which supports the cochlear duct and helps maintain its shape. The sulcus spiralis externus is bordered by the spiral prominence and the outer sulcus cells.

Function

The primary function of the sulcus spiralis externus is to provide structural support to the cochlear duct. It also plays a role in the distribution of endolymph, the fluid within the cochlear duct, which is vital for the transduction of sound waves into electrical signals by the hair cells of the organ of Corti.

Clinical Significance

Abnormalities or damage to the sulcus spiralis externus can affect the function of the cochlea and lead to hearing loss. Conditions such as Meniere's disease and cochlear otosclerosis may involve changes in the structure or function of the sulcus spiralis externus.

Related Pages

• Cochlea
• Organ of Corti
• Inner ear
• Hearing