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What is "sheath of schwann"

The Collaborative International Dictionary
Sheath of Schwann

Sheath \Sheath\, n. [OE. schethe, AS. sc[=ae][eth], sce['a][eth], sc[=e][eth]; akin to OS. sk[=e][eth]ia, D. scheede, G. scheide, OHG. sceida, Sw. skida, Dan. skede, Icel. skei[eth]ir, pl., and to E. shed, v.t., originally meaning, to separate, to part. See Shed.]

  1. A case for the reception of a sword, hunting knife, or other long and slender instrument; a scabbard.

    The dead knight's sword out of his sheath he drew.
    --Spenser.

  2. Any sheathlike covering, organ, or part. Specifically:

    1. (Bot.) The base of a leaf when sheathing or investing a stem or branch, as in grasses.

    2. (Zo["o]l.) One of the elytra of an insect.

      Medullary sheath. (Anat.) See under Medullary.

      Primitive sheath. (Anat.) See Neurilemma.

      Sheath knife, a knife with a fixed blade, carried in a sheath.

      Sheath of Schwann. (Anat.) See Schwann's sheath.