 Monitors internal and external environment  Integrates sensory information  Coordinates all systems.

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Presentation transcript:

 Monitors internal and external environment  Integrates sensory information  Coordinates all systems

 Central Nervous System (CNS)  Brain and Spinal Cord  Intelligence, Memory, Emotion  Peripheral Nervous System (PNS)  All neural tissue outside the CNS  Afferent Division  Receptor to CNS  Efferent Division  CNS to muscles and glands

 Somatic Nervous System  Control over skeletal muscle contractions  Autonomic Nervous System  Involuntary regulation

 Cell Body  Large Nucleus  No centrioles (used for division)  Neurons cannot divide  Can divide in nose (for smell) and in hippocampus (for memory)  Nissl Bodies  Rough ER and free ribosomes

 Several dendrites  Receive signals

 Axon  Usually only one/neuron  Transmits signal  Axon Hillock  Where action potentials start  Collaterals  Branches off axon

 Synaptic terminals  Site where neuron communicates with other cells

 Multipolar Neuron  Two or more dendrites  One axon  Most common  Control skeletal muscles

 Unipolar  Dendrites and axon continuous  Cell body off to one side  Sensory neurons

 Bipolar neuron  One dendrite  One axon  Sight, smell, hearing

 Sensory Neurons  Receive information from receptors  External receptors—touch, temperature, pressure and senses  Proprioreceptors—position and movement of muscles and joints  Visceral (internal) receptors—taste, deep pressure, pain

 Motor Neurons  CNS to rest of body  Interneurons  Only brain and spinal cord  Coordinate motor activity