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Transcript
FREE ICE CREAM Tuesday May 13 (4-8pm) Nervous System Unit Alzheimer’s Disease • Memory loss • Confusion • Problems speaking, understanding • Time/place? • Misplacing things • Mood swings • Personality change (suspiciousness) • Lack of interest Alzheimer’s Disease What do you notice about the different brain scans? CT/MRI scan machine Unit Goals 1. Structures and functions of nervous system 1. Neurons: Role of neurons in transmitting electrochemical impulses 1. Three types of neurons a) Sensory neurons b) Interneurons c) Motor neurons 1. Structures and Functions Structures: •brain •spinal cord •peripheral nerves •neurons Functions: •Body’s response to internal/external stimuli •Control body functions •Communication 1. Fun brain facts! • 2% of body’s weight • Uses 20% of body’s blood supply • Dieting can cause brain to eat itself! 1. Fun spinal cord facts! • 8 cervical nerves • 12 thoracic nerves • 5 lumbar nerves 1. Fun facts about nerves! • Sciatic nerve = longest and widest nerve in your body! • Runs down lower back and down the entire leg. 1. Fun fact! • Human sciatic nerve – 4 feet • Giraffe sciatic nerve – 8.5 to 10 feet 2. What is a neuron? • Neuron = Nerve cell • Carry messages • • Electrical • Chemical • Called impulses Three types • Sensory • Interneuron • Motor It’s almost Friday! Review! Neuron Anatomy • Cell body • Nucleus • Dendrites • Axon • Myelin sheath • Nodes • Axon terminals Impulse carried from neuron to neuron! Fun fact! Neurons in the brain look strikingly similar to images of the universe! Divisions of Nervous System Central Nervous System • brain • spinal cord Peripheral Nervous System • Sensory neurons • Motor neurons 2. Neurons- Electrochemical Impulses Impulse = Two signals 1) Electrical signal 1) Chemical signal 3. Three types of neurons SENSORY INTERNEURON MOTOR 3. Three types of neurons Sensory neurons: carry information… •From sensory organs (eye, ears, skin) •From sensory receptors (temperature, pressure, pain) •To brain or spinal cord 3. Three types of neurons Interneurons: connect neurons Found in… •Brain •Spinal cord 3. Three types of neurons Motor neurons Carries information… From: •brain •spinal cord To: •Muscles (hand, leg) •Glands (sweat, oil) Video- “Brain Power: From Neurons to Networks” Essential question: How are our neuron networks like the internet?
