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What is the largest nerve in the body?
Tissues, Organs, and Glands
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Epithelial cells are constantly being replaced and regenerated during an individual’s lifetime. The epidermis (outer layer of the skin) is renewed every two weeks; a totally new epidermis is produced every 25 to 30 days. The epithelial lining of the stomach is replaced every two to three days. The lining of the respiratory tract is only replaced every five to six weeks. The liver, a gland consisting of epithelial tissue, easily regenerates after portions are removed surgically.
The sciatic nerve is the largest in the human body—about as thick as a lead pencil—0.78 inch (1.98 centimeters). It is a broad, flat nerve composed of fibers that run from the spinal cord to the back of each leg.