The peripheral nervous system Flashcards
What is the peripheral nervous system used for?
The communication in the body
What are axons?
Where electrical signals travel
What are axons covered in?
Swhann cells and connective tissues
What happens if an axon is damaged, but the endo tube is intact?
The nerve will regrow down
What happens if an axon and endo tube are damaged?
The nerve may grow back down the wrong endo tube
How does information travel down the nerves?
Electrical signals
How do myelinated axons move information?
Via conduction
What are shwann cells?
Help form the myeline sheath of cells
What sensation do A-alpha sensory afferent cells send?
Proprioceptors of skeletal muscles
What sensation do B-beta sensory afferent cells send?
Mechanoreceptors of the skin
What sensations do A-delta sensory afferent cells send?
Pain and temperature
What sensations do C fibres send?
Temperature, pain and itch
How does the brain get input from the environment?
Via the PNS
What are Golgi bodies?
Cells in the muscle that detect how much stretch is needed to pick something up and tell the motor neurone
What is type 1 motor unit?
Fatigue resistant, lower activation threshold, fewer muscle fibres, and low force generation during muscle contraction
