Myelinated nerve fibers occur predominantly in the cranial and spinal nerves and compose the white matter of the brain and spinal cord. It is the myelin sheath that gives the whitish color to the areas of white matter. Unmyelinated fibers are abundant in the autonomic nervous system. Patient discussion about myelin
The actress in the Progressive Insurance commercial is Stephanie Courtney. Her commercial name is Flo. Other roles in which Stephanie Courtney has appeared: Mad Men (Marge, a secretary) Blades of Glory (reporter) The Brothers Solomon (Sara)
She starred on ER at 8 years old. Getty Images. Lily the enthusiastic AT&T employee may be relatively new, but it's hardly the first character Vayntrub ever played in a commercial. In fact, she began acting in TV ads at the age of just five years old, starring in Barbie commercials to help her family make ends meet.