1. A layer of myelin encasing (and insulating) the axons of medullated nerve fibers
   - medullary sheath

Derived forms: myelin sheaths

Type of: case, sheath

Part of: medullated nerve fiber [US], medullated nerve fibre [Brit, Cdn], myelinated nerve fiber [US], myelinated nerve fibre [Brit, Cdn]

Encyclopedia: Myelin sheath

• straight razor
• straight shooter
• straight sinus
• straight thrust
• straight ticket
• straight-arm
• straight-backed
• straight-billed
• straight-faced
• straight-fluted drill
• straight-from-the-shoulder
• straight-grained
• straight-legged
• straight-line method
• straight-line method of depreciation
• straight-out
• straightarrow
• straightaway
• straightedge
• straighten
• straighten out
• straighten up
• straightener
• straightforward
• straightforwardly