Bundles of fibers transmitting signals between brain, spinal cord, and body

• Individual conducting fibers or cords of the nervous system

Emotional control or composure; courage or fortitude

• One’s nerves as a measure of mental steadiness

A state of anxiety, tension, or shakiness; nervousness

• Temporary emotional strain caused by stress or fear

The veins of a leaf; by extension, grain in wood

Sinews or tendons; older or literary use