Final answer:
The tissue that covers your nerves is myelin, created by oligodendrocytes in the central nervous system, which aids in fast signal transmission along nerves.
Step-by-step explanation:
The tissue that covers your nerves is known as myelin. Myelin is produced by oligodendrocytes in the central nervous system, which includes the brain and spinal cord. It forms sheaths around many axons and is essential for the proper functioning of the nervous system, as it helps to increase the speed at which electrical impulses are conducted along the nerve cells. Other structures related to the central nervous system are the meninges, which include the dura mater, arachnoid mater, and pia mater, and the cerebrospinal fluid which cushions the brain and spinal cord. However, these are not the tissues that "cover" nerves as described in the question.