neurons, hormones, and the brain
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Neurons, Hormones, and the Brain. Chapter #4 . chapter 4 . Overview. The nervous system Communication in the nervous system Mapping the brain A tour through the brain The two hemispheres of the brain Two stubborn issues in brain research. Objectives. - PowerPoint PPT PresentationTRANSCRIPT
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Neurons, Hormones, and the Brain
Chapter #4
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OverviewThe nervous systemCommunication in the nervous systemMapping the brainA tour through the brainThe two hemispheres of the brainTwo stubborn issues in brain research
chapter 4
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Objectives
1. Explain the functions and components of the Central Nervous system
2. Compare and Contrast the Peripheral Nervous system and the CNS; including Sensory and Motor neurons
3. Create a Flow chart of the nervous system=ACADEMIC SKILL ALERT
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Nervous System: A Basic Blueprint
• Neuropsychology- or Neuroanatomy-study the brain and the rest of the nervous system in hopes of gaining a better understanding of consciousness, perception, memory, emotion, stress, mental disorders and self identity
• Cells, parts and functions of Neurons
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Neuropsychology
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Central Nervous System= 2 parts
• Brain and spinal cord• Spinal cord- Extension of the brain• Runs from the base of the brain down the
center of the back• Protected by a column of bones, spinal
column• Bridge between the brain and the parts of the
body below the neck
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The central nervous systemBrainSpinal cordA collection of neurons and supportive tissue running from the base of the brain down the center of the back
Protected by spinal column
chapter 4
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Central N.S.
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CSN= cont…
• Spinal reflexes- automatic behaviors, no conscious effort
• For example touch hot iron, move your hand without thinking
• React to Dr. hitting knee
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Spinal Reflexes
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Spinal reflexes cont…
• Neural circuits linked to neural pathways that run up and down the spinal cord= 2 and from the brain, As a result reflexes effected by thoughts and emotions
• For example erection in men• However you can control your knee from
jerking when it is tapped; and most men can learn to voluntarily delay ejaculation (another spinal reflex)
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Peripheral nervous system- second part
• Handles CNS input and output• Nerves on outside brain and spinal cord• fingers, toes, receiver on radio• Sensory nerves- Carry messages from skin,
muscles, to spinal cord then brain• Motor Nerves- Carry orders from CNS to muscles,
glands, internal organs. Allow us to move, secrete substances like chemical messengers-Hormones.
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Hormones
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Organization of the nervous system
chapter 4
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Peripheral Nervous system: two parts
• Somatic-bodily• Autonomic- (self-governing)• Somatic Nervous system, Skeletal nervous
system.• Connected to sensory receptors and to the
skeletal muscles, permit voluntary actions• F.E. bug on arm, write name, turn on lights=
somatic system active
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Compare and Contrast
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Autonomic Nervous System
• Autonomic- (self-governing)• Regulates blood vessels• Internal, bladder, stomach, heart• See hot –guy/girl hands sweat, heart pounds• Automatically, without your control• Autonomic in 2 parts as well
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Work together in opposing ways
• Sympathetic nervous system- like accelerator in car. Output, energy. Blush, sweat, pushes up HR/ BP
• Parasympathetic- More like a brake, conserve and store energy. Slows HR down
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Compare and Contrast
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Summary
• Main components of CNS• Peripheral nervous system