Spiral ligament

Spiral ligament (also known as spiral ligament of cochlea) is a fibrous ligament that is an integral part of the cochlea, which is a component of the inner ear. It plays a crucial role in the process of hearing.

Etymology

The term "spiral ligament" is derived from its spiral shape that follows the coiling of the cochlea. The word "ligament" comes from the Latin "ligamentum", meaning "a band or tie," which refers to the ligament's role in connecting or binding various body structures.

Anatomy

The spiral ligament extends from the basilar membrane to the osseous spiral lamina, forming the outer wall of the cochlear duct. It is composed of two parts: the thicker part, which is attached to the osseous spiral lamina, and the thinner part, which is attached to the wall of the cochlea.

Function

The primary function of the spiral ligament is to support the organ of Corti, which is the sensory organ of hearing. It also plays a role in maintaining the ionic composition of the endolymph, which is essential for the proper functioning of the hair cells in the organ of Corti.

Related Terms

• Cochlea: The spiral-shaped, fluid-filled inner ear structure; it is the organ of hearing.
• Basilar membrane: A membrane in the cochlea that separates two fluid-filled spaces and on which the organ of Corti is located.
• Osseous spiral lamina: A bony shelf within the cochlea that supports the organ of Corti.
• Organ of Corti: The sensory organ of hearing that resides on the basilar membrane inside the cochlea.
• Endolymph: The fluid within the cochlea that plays a crucial role in the process of hearing.

See Also

• Inner ear
• Hearing
• Ligament

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