fas·​cic·​u·​lus | \ fə-ˈsi-kyə-ləs How to pronounce fasciculus (audio) , fa- \
plural fasciculi\ fə-​ˈsi-​kyə-​ˌlī How to pronounce fasciculus (audio) , fa-​ \

Definition of fasciculus

1 : a slender bundle of anatomical fibers (such as nerve fibers)

Examples of fasciculus in a Sentence

Recent Examples on the Web Our mental calendar involves circuits in the left angular gyrus, important for sequence discrimination and connected to the same hippocampal place cell or grid cell via a band of fibers: the inferior longitudinal fasciculus. Scientific American, 1 June 2020 This view shows the three major tracts involved with language and literacy skills: the arcuate fasciculus, shaded in white, which connects brain areas involved with receptive and expressive language. Sandee Lamotte, CNN, 4 Nov. 2019 Connecting Broca’s area with Wernicke’s is a neural network: a thick, curving bundle of billions of nerve fibres, the arcuate fasciculus, which integrates the production and the comprehension of language. Rachel Aviv, The New Yorker, 25 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fasciculus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of fasciculus

1713, in the meaning defined at sense 1

History and Etymology for fasciculus

New Latin, from Latin

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The first known use of fasciculus was in 1713

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Cite this Entry

“Fasciculus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fasciculus. Accessed 27 Oct. 2021.

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More Definitions for fasciculus


fas·​cic·​u·​lus | \ fə-ˈsik-yə-ləs, fa- How to pronounce fasciculus (audio) \
plural fasciculi\ -​ˌlī How to pronounce fasciculus (audio) \

Medical 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 sense 2


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