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. [1913 Webster]

The dead knight's sword out of his sheath he drew. --Spenser. [1913 Webster]

2. Any sheathlike covering, organ, or part. Specifically: (a) (Bot.) The base of a leaf when sheathing or investing a stem or branch, as in grasses. (b) (Zo["o]l.) One of the elytra of an insect. [1913 Webster]

{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}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • sheath of Schwann — shwän n NEURILEMMA T. A. H. Schwann see SCHWANN CELL * * * neurilemma …   Medical dictionary

  • sheath of schwann — ˈshwän, ˈshvän Usage: usually capitalized 2d S Etymology: after Theodor Schwann died 1882 German naturalist : neurilemma 1 …   Useful english dictionary

  • substance of schwann — ˈshw]än, ˈshf], ˈshv] Usage: usually capitalized 2d S Etymology: after Theodor Schwann died 1882 German anatomist : medullary sheath …   Useful english dictionary

  • 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.… …   The Collaborative International Dictionary of English

  • Sheath knife — 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… …   The Collaborative International Dictionary of English

  • sheath — I (New American Roget s College Thesaurus) n. scabbard, sheathing, case, envelope, casing; involucre, capsule, fascia, lorica. See covering, receptacle. II (Roget s IV) n. Syn. case, scabbard, cover, spathe, sheathing, cere. Specialized sheaths… …   English dictionary for students

  • Schwann cell — Structure of a typical neuron Schwann cells wrapped around an axon Dendrite …   Wikipedia

  • sheath — 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. SYN: vagina (1). 2. The prepuce of male animals, especially of the horse. 3. A specially designed tu …   Medical dictionary

  • Schwann — Theodor, German histologist and physiologist, 1810–1882. See S. cells, under cell, S. cell unit, S. white substance, sheath of S …   Medical dictionary

  • Schwann cell — shwän n a cell that forms spiral layers around a myelinated nerve fiber between two nodes of Ranvier and forms the myelin sheath consisting of the inner spiral layers from which the protoplasm has been squeezed out Schwann shvän Theodor Ambrose… …   Medical dictionary

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