Arcuate eminence

Arcuate Eminence

The Arcuate Eminence is a prominent feature of the human anatomy, specifically within the inner ear. It is a bony elevation located in the anterior part of the petrous part of the temporal bone, and is the surface manifestation of the anterior semicircular canal.

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Arcuate Eminence (shown in red) in relation to the inner ear

Structure

The Arcuate Eminence is a rounded, convex structure that is situated above the internal auditory meatus. It is formed by the anterior semicircular canal, which is part of the vestibular system responsible for maintaining balance and spatial orientation. The eminence is covered by a thin layer of dura mater, a protective membrane of the brain and spinal cord.

Function

The primary function of the Arcuate Eminence is to protect the anterior semicircular canal. This canal plays a crucial role in the vestibular system, detecting rotations of the head in the sagittal plane (nodding motion). The information gathered by the canal is then transmitted to the brain to help maintain balance and spatial orientation.

Clinical significance

Abnormalities or damage to the Arcuate Eminence can lead to a variety of medical conditions. For instance, a dehiscent Arcuate Eminence, where the bone covering the anterior semicircular canal is absent or thin, can result in symptoms such as vertigo and tinnitus. This condition is often diagnosed using computed tomography (CT) scans.

See also

• Inner ear
• Vestibular system
• Anterior semicircular canal
• Petrous part of the temporal bone