fasciculus is a topic covered in the Taber's Medical Dictionary.

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(fă-sik′yŭ-lŭs )

pl. fasciculi [L. fasciculus, a small bundle]

1. A small bundle of longitudinal elements, e.g., muscle fibers.
2. A bundle of axons. Peripheral nerves can contain one or more axonal fasciculi. In the brain and spinal cord, many of the fasciculi are named, and fasciculus and tract are synonymous.

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