What is the nervous tissue? (histologic and anatomic level)

At the histological level, nervous tissue is formed of 2 types of cells: nerve cells (or neurons) and glial cells. These cells, along with their intercellular medium and a rich blood capillaries network, form the nervous system. Considering the anatomical, physiological or functional levels, we distinguish: - The central nervous system (CNS) consisting of the brain and spinal cord; it is the body’s central control system, and is protected by the skull and the vertebral column. - The peripheral nervous system (PNS) consisting of the nerve fibers emerging from the brain (cranial nerves) and the spinal cord (spinal nerves) and reaching all the organism; these nerves link the CNS to receptors, muscles and glands