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Per·i·neu·ri·um

/ˌperəˈno͝orēəm/

noun
- 1. the sheath of connective tissue surrounding a bundle (fascicle) of nerve fibers within a nerve.
Word Origin mid 19th century: modern Latin, from Greek peri- ‘around’ + neuron ‘sinew’.
Scrabble Points: 15
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Perineurium
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Sheath around nerve bundles
The perineurium is a protective sheath that surrounds a nerve fascicle. This bundles together axons targeting the same anatomical location. The perineurium is composed from fibroblasts. In the peripheral nervous system, the myelin sheath of each axon in a nerve is wrapped in a delicate protective sheath known as the endoneurium. Fascicles, bundles of neurons, are surrounded by the perineurium. Wikipedia
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