The correct answer is option 2: nerves. Nerve tissue is a type of tissue found in the nervous system, which includes the brain, spinal cord, and nerves. Unlike other tissues in the body, nerve tissue does not undergo cell division after birth. Once the nervous system is fully developed, the nerve cells or neurons stop dividing and do not regenerate. This lack of cell division is because nerve cells have limited regenerative abilities and typically do not reproduce or replace themselves. Therefore, nerve tissue is one of the few tissues in the human body where cell division does not occur after birth.