fasciculus

fas·cic·u·lus

noun \fə-ˈsik-yə-ləs, fa-\

plural fas·cic·u·li \-ˌlī\

Definition of FASCICULUS

: a slender bundle of fibers: a : a bundle of skeletal muscle cells bound together by fasciae and forming one of the constituent elements of a muscle b : a bundle of nerve fibers that follow the same course but do not necessarily have like functional connections (as in some subdivisions of the funiculi of the spinal cord)—compare tract 2 c : tract 2