The human neural (nervous) system originates from the ectoderm. The human neural system can be divided into: img 2 Two main parts of human neural/nervous system are: � Central Nervous System (CNS). � Peripheral Nervous System (PNS). 1. Central Nervous System (CNS) indicates the (i) brain which is located in skull/cranium and protected by meninges (membranes) and cerebro spinal fluid to avoid jerks and shocks. Spinal cord is the extension of brain into the vertebral column. Both are the sites of information processing and control. The Peripheral Nervous System (PNS) is made up of all the nerves of the body and are associated with the CNS. The PNS has two types of nerve fibres. (a) Afferent Fibres: Those nerve fibres that transmit impulses from body tissues/organs to CNS are called afferent fibres. img 3 (b) Efferent Fibres: Those nerve fibres that transmit regulatory impulses from CNS to concerned peripheral tissues/organs are called efferent fibres. img 4 2. Peripheral Nervous System (PNS) is divided into (a) somatic nervous system and (b) autonomic nervous system. (a) Somatic Nervous System sends impulses from the CNS to skeleted muscles (voluntary) of the body. (b) Autonomic neural system sends impulses from the CNS to involuntary muscles and organs of the body. It is further classified into: (i) Sympathetic nervous system, (ii) Parasymphathetic nervous system. Visceral nervous system is the part of peripheral nervous system that comprises of: Whole complex nerves, fibres, ganglia and plexuses. By which the impulses travels from CNS ? Visceral ? PNS