Post on 22-Dec-2015
transcript
OverviewThe 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
chapter 4
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
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
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
The central nervous system
BrainSpinal 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
CSN= cont…
• Spinal reflexes- automatic behaviors, no conscious effort
• For example touch hot iron, move your hand without thinking
• React to Dr. hitting knee
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)
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.
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
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
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