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Transcript
NERVOUS SYSTEM CENTRAL AND PERIPHERAL CENTRAL NERVOUS SYSTEM • Consists of your brain and spinal cord. THE BRAIN IS THE MAIN CONTROL CENTER OF THE NERVOUS SYSTEM. THE BRAIN HAS 3 MAIN PARTS: CEREBRUM, CEREBELLUM AND THE MEDULLA. EACH HAS ITS OWN JOB. 3 MAIN PARTS OF THE BRAIN CEREBRUM: LARGEST PART OF THE BRAIN. IT CONTAINS 2 HALVES, RIGHT HEMISPHERE DIRECTS THE LEFT SIDE OF BODY AND LEFT HEMISPHERE CONTROLS THE RIGHT SIDE OF THE BODY. CEREBELLUM: SECOND LARGEST PART OF THE BRAIN. THIS PROCESSES SENSORY INFORMATION FROM YOUR BODY AND IS LOCATED BELOW THE CEREBRUM. MEDULLA: CONNECTS BRAIN TO SPINAL CORD. THIS CONTROLS INVOLUNTARY PROCESSES SUCH AS BLOOD PRESSURE, BODY TEMPERATURE, HEART RATE AND BREATHING. 3 Main Parts of the Brain LOBES OF THE BRAIN FRONTAL LOBE: In charge of speech, movement, emotions, problem solving, memory OCCIPITAL LOBE: In charge of vision PARIETAL LOBE: In charge of touch, temperature and pain TEMPORAL LOBE: In charge of hearing THE SPINAL CORD The nerve fibers in your spinal cord allow the brain to communicate with your peripheral nervous system. PERIPHERAL NERVOUS SYSTEM Messages about your environment travel through the nervous system called neurons. A neuron is a nerve cell that is specialized to transfer messages in the form of fast-moving electrical energy. These electrical messages are called impulses. A neuron has a large region in the center called the cell body. Dendrites are usually short, branched extensions of the cell. Axons are elongated extensions of the neuron. The tip of each axon is called the axon terminal. NEURONS A new born babies brain grows 3 times in the 1st year If we lined up all of the brains neurons it would stretch 600 miles Average Human Brain weighs 3 lbs. Fun Facts As we get older the brain loses 1 gram per year in weight The folds of the brain are called Gyri There are 100 billion neurons in your brain
