Spiral limbus

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Structure in the cochlea of the inner ear

The spiral limbus is a structure located in the cochlea of the inner ear. It plays a crucial role in the auditory system by supporting the tectorial membrane and contributing to the overall function of the organ of Corti.

Anatomy

The spiral limbus is situated on the osseous spiral lamina, a bony shelf that projects from the modiolus, the central core of the cochlea. It is composed of connective tissue and is covered by a layer of epithelial cells. The spiral limbus extends along the length of the cochlea, from the base to the apex.

Function

The primary function of the spiral limbus is to support the tectorial membrane, a gelatinous structure that overlies the organ of Corti. The tectorial membrane is essential for the proper transduction of sound waves into neural signals. The spiral limbus also contributes to the formation of the inner sulcus, a groove that separates the tectorial membrane from the organ of Corti.

Clinical Significance

Damage or abnormalities in the spiral limbus can affect hearing. Conditions such as sensorineural hearing loss may be associated with defects in the structures supported by the spiral limbus. Research into the spiral limbus and its associated structures continues to be important for understanding and treating various auditory disorders.

See also

• Cochlea
• Organ of Corti
• Tectorial membrane
• Inner ear
• Sensorineural hearing loss