Circulatory System

• The nervous system has two main components: the central nervous system (CNS) and the peripheral nervous system (PNS).
• • Central nervous system (CNS) - is made up of the brain and spinal cord.
• • Nerve : is a cordlike bundle of fibers
• • Nervous system : is a complex network of nerves
• • Neurons : cells that make up he brain and the nervous system
• • Nerve cell : is the basic functional unit of he brain and is designed to transmit information to other nervecells
• • Cell body : contains the nucleus and connects to the dendrites and the axons
• • Dendrites are tubelike branches that recieve information from other neutrons
• • Sensory neurons : nerve cells that are activated by input
• • Motor Neutrons : carry messages from the brain
• • Interneurons : create neural pathways
• • Brain : is a highly specialized organ in the nervous system
• • Cerebrum : is the largest part of the brain
• • Cerebellum : is located under the cerebrum
• • Brain stem : is found in the lowest part of the brain
• the cerebrum consists of two hemispheres, The left hemispere and The right hemisphere
• • Left hemisphere: controls the right side of the body
• • Right hemisphere: controls the left side of the body
• • Spinal cord : is a bundle of nerve tissues
• • Peripheral nervous system : consists of the nerves and nerve clusters