Abstract
The spinal accessory nerve, primarily a motor nerve, innervates the sternocleidomastoid and trapezius muscles. Proximally, lesions can occur intracranially at the skull base or just outside the jugular foramen producing ipsilateral weakness of trapezius and sternocleidomastoid muscles; or distally, in the posterior neck triangle causing trapezius muscle weakness.
MeSH terms
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Accessory Nerve / pathology*
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Accessory Nerve / physiopathology*
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Accessory Nerve Diseases / diagnosis*
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Accessory Nerve Diseases / etiology*
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Accessory Nerve Diseases / pathology
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Accessory Nerve Diseases / physiopathology
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Humans
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Magnetic Resonance Imaging
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Muscle Weakness / etiology
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Muscle Weakness / physiopathology*
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Neck Muscles / innervation*
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Neck Muscles / physiopathology
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Tomography, X-Ray Computed