Nervous System Flashcards
What does the nervous system allow us to do?
Detect change and receive info from our sense organs
The nervous system is divided into 2 parts?
1) Central nervous system (CNS)
2) Peripheral nervous system (PNS)
The CNS is made up of what 2 body parts?
1) brain
2) spinal cord
The PNS is divided into somatic ( 31 spinal nerves ) and autonomic which is nerves in what part of the body?
12 cranial nerves within the brain
What is a neuron?
Carry’s messages as electrical and chemical impulses to allow rapid communication
Sensory input > brain > __?__ output
Motor
What is the cell body of a neuron called?
Soma
What is an axon?
The long bit in the middle of a neuron
What does a dendrite do?
Receives signals from other neurons
What is structural classification?
What they look like
Multi - multiple
Uni - 1
So Bi means?
2
Afferent is the?
Arrival
What is a nerve?
Collections of nerve cell axons
Many neurons are wrapped in myelin, creating a?
Myelin sheath
Myelin sheath allows for what sort of conduction of the electrical pulse?
Electrical
Demyelination ( loss / damage of myelin ) results in?
Reduced reduction
Information from one neuron flows to another neuron across a small gap called?
Synapse
The cell that sends info is called the presynaptic neuron and the the cell that receives info is called the?
Postsynaptic neuron
A nerve impulse is carried across the gap between neurons by chemicals called?
Neurotransmitters
After the action potential is initiated which part of a neuron does the impulse travel along.
Axon
A neuron carrying impulses to the CNS ( arrival ) is called what type of neuron?
Afferent
Chemical molecules that send signals across synapses are called?
Neurotransmitters
What are spinal nerves?
A collection of axons
The brain is divided into what 3 parts?
1) cerebrum - sensory
2) cerebellum - balance & movement
3) the brain stem - automatic functions such as Bp, heart rate, arousal and attention
