Nervous System
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what is the central nervous system comprised of (CND)
Brain and spinal cord
Purpose of the nervous system
Gather information, process it and determine a appropriate response
Sensory input
Sensory receptors detect stimuli
Integration
How the nervous system processes information
Motor output
Activated muscles and glands
What is the PNS for
Sensory input: motor output
What is the PNS
Cranial nerves and spinal nerves
How is the PNS and CNS connected
The PNS is the communication lines between the CNS and the rest of the body
Motor division
Conducts impulses from CNS to effectors
What are effectors
Muscles and glands
What is sensory division
Conducts impulse from receptors to CNS
Somatic nervous system
Conducts impulses from CNS to skeletal muscles
Do you have control over the SNS
Yes you have control (voluntary) over the somatic nervous system
Autonomic nervous system
Conducts impulses from CNS to cardiac muscles and glands
Do you have control over the autonomic nervous system
No control (involuntary)
Sympathetic division
Fight or flight
Parasympathetic division
Conserves energy, rest and digest
Nervous tissue
2 types of cells, neurons, and Schwann cells
Neurons
They are cells that conduct impulses
Schwann cells
Support cells and nourish them, wrap around neurons, impulses can’t pass through
Cell body
Contain nucleus, biggest part of neuron, if damaged the whole neuron dies
Dendrites
Branch from cell body, Carey a nerve impulse TO CELL BODY
Axon
Long branch from cell body, Carry’s impulses AWAY FROM CELL BODY
Myelin sheath
Made of Schwann cells wrapped around the axon