Medullary sheath Meaning, Definition & Usage

  1. noun a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
    myelin sheath.

WordNet

Definitions
  1. (Anat.), the layer of white semifluid substance (myelin), between the primitive sheath and axis cylinder of a medullated nerve fiber.
Definitions
  1. . (Anat.) See under Medullary.

Webster 1913