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Use "fasciculi" in a sentence
"These fibers, in turn, are further bound together to form larger bundles called fasciculi, and these, too, are enclosed in a sheath of connective tissue."
"The bundles are termed fasciculi; they are prismatic in shape, of different sizes in different muscles, and are for the most part placed parallel to one another, though they have a tendency to converge toward their tendinous attachments."
"Pick the bundles and fasciculi apart until the fibers are so fine as to be almost invisible to the naked eye."