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

3.  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

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

7.  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

9.  Several dendrites  Receive signals

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

13.  Synaptic terminals  Site where neuron communicates with other cells

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

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

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

21.  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

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