Sensory neurons
Detect changes in the external/internal environment and sends info to CNS
Motor neuron
Located in the CNS that controls contraction of a muscle or secretion of a gland
Interneurons
In the CNS
○ Local - form circuits with nearby neurons and analyze small pieces of information
○ Relay - connect circuits of local interneurons in one region of the brain with other regions
Neuron Structure - Cell Body/Soma
Contain nucleus, machinery for life processes of the cell
Neuron Structure- Dendrites
- Recipients of messages transmitted through the synapse
- Synapse: junction between terminal buttons of an axon and membrane of another neuron
Neuron Structure - Axon (function)
Tube covered in (white matter) myelin sheath, carries information to the terminal button using action potentials
Action Potential
starts at the end of the axon next to cell body and travels to terminal buttons.
Axon - Multipolar neurons
one axon but trunks of many dendritic trees
Axon - Bipolar Neuron
one axon and one dendritic tree at opposite ends of soma
-usually sensory
Axon - Unipolar Neuron
one stalk, leaving the soma, dividing into two branches
- sensory info from environment to CNS
- touch, temp change, and other skin changes
Axon - Unipolar Neuron
one stalk, leaving the soma, dividing into two branches
- sensory info from environment to CNS
- touch, temp change, and other skin changes
Terminal Buttons
Bud at the end of the axon, forming synapses with other neurons , sends info to next neuron
membrane
boundary of the cell, contains protein molecules with special functions
