fasciculus
noun
fas·cic·u·lus
fə-ˈsi-kyə-ləs 
fa-
plural fasciculi
fə-ˈsi-kyə-ˌlī
fa-
1
: a slender bundle of anatomical fibers (such as nerve fibers) : fascicle sense 1b
2
: one of the divisions of a book published in parts : fascicle sense 2
Examples of fasciculus in a Sentence
Recent Examples on the Web
The vertical occipital fasciculus (VOF) debuted in an atlas by German psychiatrist and anatomist Carl Wernicke in 1881.
—
Jenny Blair, Discover Magazine, 1 Oct. 2015
The vertical occipital fasciculus, or VOF, is identified in a postmortem human brain in 1909, but labeled with a different name.
—Jenny Blair, Discover Magazine, 1 Oct. 2015
But the children in the two groups exhibited differences in the arcuate fasciculus and the ILF: In strong readers, these nerve connections started weak, then strengthened; the neuron bundles got more myelinated.
—Ashley P. Taylor, Discover Magazine, 10 Oct. 2012
This scan shows the difference between a control brain scan (yellow) and the scan of vets (red) in the right inferior fronto-occipital fasciculus.
—Florence Williams, Discover Magazine, 30 July 2014
In particular, damage to a bundle of axons called the right inferior fronto-occipital fasciculus correlated with the severity of pain and fatigue.
—Gemma Tarlach, Discover Magazine, 20 Mar. 2013
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
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Jenny Blair, Discover Magazine, 1 Oct. 2015
The vertical occipital fasciculus, or VOF, is identified in a postmortem human brain in 1909, but labeled with a different name.
—Jenny Blair, Discover Magazine, 1 Oct. 2015
But the children in the two groups exhibited differences in the arcuate fasciculus and the ILF: In strong readers, these nerve connections started weak, then strengthened; the neuron bundles got more myelinated.
—Ashley P. Taylor, Discover Magazine, 10 Oct. 2012
This scan shows the difference between a control brain scan (yellow) and the scan of vets (red) in the right inferior fronto-occipital fasciculus.
—Florence Williams, Discover Magazine, 30 July 2014
In particular, damage to a bundle of axons called the right inferior fronto-occipital fasciculus correlated with the severity of pain and fatigue.
—Gemma Tarlach, Discover Magazine, 20 Mar. 2013
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
Cite this Entry
“Fasciculus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fasciculus. Accessed 2 May. 2025.
Copy CitationMedical Definition
fasciculus
noun
fas·cic·u·lus
fə-ˈsik-yə-ləs, fa-
plural fasciculi
-ˌlī
: a slender bundle of anatomical fibers:
a
: a bundle of skeletal muscle cells surrounded by perimysium and forming one of the constituent elements of a muscle
b
: a bundle of nerve fibers surrounded by perineurium
specifically
: a bundle of nerve fibers having a common origin, termination, and function : tract sense 2
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