root filament (radicular fila, dorsal/ventral rootlet)
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Introduction
The small individual fiber fascicles into which the roots of all of the spinal nerves & several cranial nerves (hypoglossus, vagus, oculomotorius) divide in fanlike fashion before entering or leaving the spinal cord.
Dorsal filaments: carry sensory information to the CNS
Ventral filaments: convey motor information from the CNS to the periphery