WSU BIOLOGY 251 - Central Nervous System (4 pages)

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Central Nervous System

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Central Nervous System


introduction into the nervous system how neurons are organized into functioning units that allow you to think, walk, smell, feel pain, etc

Lecture number:
Lecture Note
Washington State University
Biology 251 - Introductory Human Physiology

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BIO 251 1nd Edition Lecture 6 Outline of Last Lecture I Membrane potential II Action potentials III Neuron and the conduction of action potentials IV Graded Potential Outline of Current Lecture I Parkinsons II Organization of nervous system a CNS b PNS III 3 classes of neurons a Afferent b Efferent c Interneurons IV The brain gross structure a Brain stem b Cerebellum c Hypothalamus d Thalamus e Cerebellum f Limbic system These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Current Lecture Parkinson s symptoms o Tremors o Rigidity o Difficulty moving o Impairment of memory and thinking o Affects 1 of population over age 60 o Causes Poorly known Parkinson s mechanism o Destroys dopamine secreting cells in the brain stem o Axon terminals from these cells are in the basal nuclei o Lack of dopamine means neurons in basal nuclei not getting messages they need so become non functional Organizations of a nervous system o CNS integrates issues info Brain Spinal cord o PNS Afferent division sends info to CNS Efferent division receives info from CNS Somatic nervous system Autonomic nervous system Sympathetic nervous system Parasympathic nervous system Three classes of neurons fig 7 4 o Afferent neurons Have sensory receptors Axon terminals in CNS Send info in CNS o Efferent neurons Cell body in CNS Axon terminals in effector organ Send info from CNS to body o Interneurons Lie within CNS Some connect afferent neurons efferent neurons Integrate peripheral responses peripheral info Some connect with interneurons Responsible for activity of the mind thoughts emotions motivation 99 of all neurons are interneurons The Brain Gross structure associated functions 9 11 Brain stem o Critical connecting link between entire brain spinal cord o Cardiovascular respiratory digestive control o Regulation of muscle reflexes equilibrium posture o Reception integration of spinal cord input arousal

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