Chapter 2 Neuroscience 2 of 51 A Little Exercise See in class!
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Transcript of Chapter 2 Neuroscience 2 of 51 A Little Exercise See in class!
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Chapter 2Neuroscience
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A Little Exercise
See in class!
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Brain and Mind
P h ys ica l
Th e B ra in
P sych o log ica l
Th e M in d
Th e P erson
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Topics to Explore
1. The Neuron
2. The Peripheral Nervous System
3. The Central Nervous System
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Part 1The Neuron
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Neuron: Individual nerve cell; 100 billion in brain- Dendrites: Receive messages from other neurons;
have thousands of branches- Soma: Cell body; metabolic center of neuron; contains
genetic material- Axon: Carries information away from the cell body;
longest part of neuron- Axon Terminals: Branches that link the dendrites and
soma of other neurons- Synaptic Gap: Space between the end of the axon of
one neuron and the dendrites of an adjacent neuron
Neuron and Its Parts
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Picture of a Neuron
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• Resting Potential: Electrical charge of an inactive neuron
• Threshold: Trigger point for a neuron’s firing
• Action Potential: Nerve impulse
The Nerve Impulse
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Resting Potential
Resting Potential: Tiny charge between inside & outside of
neuron
• Created by electrically charged particles (ions)
- Some concentrated outside the cell (sodium and
chloride ions)
- Some concentrated inside the cell (Potassium ions)
• How is the charge maintained?
- Sodium-potassium pump
- Selectively permeable cell membrane
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Action Potential
Action potential: Change in potential, primarily because
of messages from other neurons
• Excitatory messages: Cell loses the negative charge;
Depolarization
• Inhibitory messages: Cell becomes more negatively
charged; Hyperpolarization
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Resting vs. Action Potential
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Graphic: Action Potential
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Graphic: Action Potential
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Graphic: Synaptic Gap
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Neurotransmitters: Chemicals that alter activity in
neurons; brain chemicals. Messages from one neuron to
another pass over the synapse, the microscopic gap
between neurons
Receptor Site: Areas on the surface of neurons and other
cells that are sensitive to neurotransmitters
Antagonist: drug that decreases activity of a neurotrans-
mitter
Neurotransmitters
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Some Neurotransmitters
• Acetylcholine: involved in learning, memory, and muscle contractions. Botulism toxin prevents release of acetylcholine, resulting in paralysis
• Dopamine: involved in arousal, mood, and movement. In Parkinson’s, receptors in brain fail to react to dopamine, leading to tremors, rigidity and problems initiating movement
• Serotonin and Norepinephrine: involved in arousal and mood. Cocaine blocks re-uptake of both neurotransmitters, resulting in “high”
• GABA (gamma-aminobutyric acid): main inhibitory neurotrans-mitter; lowers arousal and anxiety
• Endorphins: lower pain perception. Morphine and heroin bind to endorphin receptors, increasing endorphin activity.
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• Nerves: Large bundles of neurons
• Myelin: Fatty layer of tissue that coats axons
• Multiple Sclerosis (MS) occurs when myelin layer is destroyed; numbness, weakness, and paralysis occur
Nerves and Neurons
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A Little Exercise
Demonstration of the speed of a neural impulse.
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An Organizational Pause:
Organization of the Nervous System
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• Central Nervous System (CNS): Brain and spinal cord
• Peripheral Nervous System: All parts of the nervous system outside of the brain and spinal cord
- Autonomic System: Serves internal organs and glands; controls automatic functions such as heart rate and blood pressure
- Somatic System: Links spinal cord with skeletal muscles and sense organs; controls voluntary behavior
Major Sections of the Nervous System
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Organization of Nervous System
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Graphic: Nervous System
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Part 2The Peripheral Nervous System
• The Autonomic Nervous System
• The Somatic Nervous System
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• Sympathetic: Arouses body; emergency system
• Parasympathetic: Quiets body; most active after an
emotional event
Divisions of Autonomic System
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Functions of Autonomic Nervous System
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Three Components of Emotion
• Physical component: state of physiological arousal triggered by autonomic nervous system
• Behavioral component: outward expression of the emotion, including facial expression & behavior
• Cognitive component: appraisal of the situation to determine which emotion we are experiencing and why
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James-Lange Theory of Emotion
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Cannon-Bard Theory of Emotion
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Schachter-Singer Theory
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Comparison of Three Theories of Emotion
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Somatic Nervous System
• Motor Nervous System: transfers messages from CNS to control function of voluntary muscles
• Sensory Nervous System: transfers messages from sensory organs to CNS; brings information from outside the body to the brain to be processed
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Structures in Somatic System
• Sensory neuron: neuron that transmits information from sensory organ to CNS
• Motor neuron: neuron that transmits information from CNS to voluntary muscle
• Connector neuron: neuron in spinal cord connecting sensory and motor neurons to form reflex arc.
• Reflex: An innate, automatic motor response to a specific sensory stimulus
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Graphic: Somatic Nervous System
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Motor & Somatosensory Areas in Cerebral Cortex
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Motor Homunculus
“homunculus” = “a diminutive human being”
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Somesthetic Homunculus
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A Little Exercise
A demonstration of the somatosensory system, using toothpicks and little rulers.
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Part 3The Central Nervous System
• The Spinal Cord
• The Brain
- The Central Core
- The Limbic System
- The Cerebral Cortex
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• Spinal Nerves: 31 of them; carry sensory and motor messages to and from the spinal cord
• Cranial Nerves: 12 pairs that leave the brain directly; also work to communicate messages
• Spinal cord functions to connect peripheral nervous system to the brain
The Spinal Cord
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The Central Core(aka the “old brain”)
• Medulla: Connects brain with the spinal cord and controls vital
life functions such as heart rate and breathing
• Cerebellum: Regulates posture, muscle tone, muscular
coordination, and procedural learning
• Reticular formation: Associated with levels of arousal and
consciousness, as well as some reflexes (breathing, coughing,
sneezing, vomiting)
• Thalamus: serves as a relay station for incoming sensory
Information
• Basal ganglia: involved in physical movement
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Graphic: Central Core
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The Limbic System
At the top border (limbus in Latin) of the brain stem.
•Hypothalamus: controls pituitary gland (directing activity of
endocrine system) and autonomic nervous system; involved in
basic drives (eating, drinking, sex)
• Hippocampus: involved in formation of memories
• Amygdala: involved in regulating emotional experiences,
particularly initial emotional responses
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Graphic: Limbic System
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• Cerebral Cortex: Outer layer of the cerebrum
• Cerebrum: Two large hemispheres that cover upper part of the brain
• Corticalization: Increase in size and wrinkling of the cortex
• Cerebral Hemispheres: Right and left halves of the cerebrum
• Corpus Callosum: Bundle of fibers connecting cerebral hemispheres
Neocortex
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Graphic: Relative Size
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Graphic: Corpus Callosum
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Left & Right Hemispheres
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• About 95 percent of our left brain is used for language
• Left hemisphere better at math, judging time and rhythm, and coordinating order of complex movements
- Processes information sequentially
• Right hemisphere good at perceptual skills, and at expressing and detecting other’s emotions
- Processes information simultaneously
Left Brain/Right Brain
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Graphic: Left vs. Right
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• Occipital Lobe: Back of brain; vision center
• Parietal Lobe: Just above occipital; bodily sensations such as touch, pain, and temperature (somatosensory area)
• Temporal Lobe: Each side of the brain; auditory and language centers
• Frontal Lobe: Movement, sense of smell, higher mental functions; contains motor cortex; controls motor movement
Lobes of the Neocortex
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Graphic: Lobes