More trip calculations. 1  driving time from Rome, Italy to Lucca, Italy. 2  reverse drive distance from Lucca, Italy to Rome, Italy. 3  halfway between Rome, Italy and Lucca, Italy. 4  hotels near Lucca, Italy. 5  flight distance from Rome, Italy to Lucca, Italy. 6  flight time from Rome, Italy to Lucca, Italy.
Surrounding each muscle fiber (cell) is a delicate external lamina composed primarily of reticular fibers. This external lamina is produced by the muscle fiber and, when observed through the light microscope, cannot be distinguished from the cell membrane of the muscle fiber, the sarcolemma.
A fiber made up of many axons is called a nerve. In the brain and spinal cord, areas that are mostly axons are called white matter, and it is possible to differentiate pathways or tracts of these axons. Areas that include large number of cell bodies are called gray matter.