- Central Nervous System (CNS) - brain and spinal cord
- Peripheral Nervous System (PNS) - everything outside the brain and spinal cord with represented the input and outputpathways
- Sensory System - nervous system "input device"
- Motor System - output system
- Somatic Nervous System - controls skeletal muscle and usually voluntary movements
- Automatic Nervous System - controls smooth and cardiac muscle in your orgons
- Parasymphathetic - resting and digesting
- deals with normal functioning
- Sympathetic - fight or flight
- body's alert system
- Nervous tissue - contains no epithelium, no connective tissue and no muscle tissue
Four types of (CNS) :
- Astrocytes - metabolic and structural support cells
- Microglia - remove debris
- Epedymal - covering and lining cavities
- Oligodendrytes - make a lipid insulation called myelin
- Schwann cells - makes myelin for PNS
- Satellite cells - support cells
Neurons - Control function of the nervous system
- dendrites - receive information from the environment of from other cells
- axon - generates and send signals to other cells
- axon terminal - connects to a receiving cell
- synapse - combination of axon terminal and receiving cell
- neuromuscular synapse or junction - the receiving cell is skeletal muscle
- sensory neuron - input neurons
- motor neuron - output neurons
- inter neurons - neurons that carry info. between neurons
- Neurons - an exitable cells
- carries a small electrical charges
- Polarized - not stimulating, resting cell
- Depolarized - more positive than resting cells
- Repolarization - the inside of the cells becomes more negative again, returning to rest
- Hyperpolarized - more negative than at rest
- action potential - whole series of permeability changes
- local potential - the size of the stimulus determines the excitement of the cell
- impulse conduction - action potential travels down the axon from tha cell body to the terminal
- nodes of Ranvier - bare spots between adjacent glial cells
- neurotransmitters - sends signal
- spinal cord - located in a hollow tube running inside the vertebral column
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