★ Must-know
Further detail
Nerves contain sensory fibers, motor fibers, or both, including 12 pairs of cranial nerves and 31 pairs of spinal nerves.
The nerve centers are protected by three membranes called the meninges.
Centers → nerves → muscles or glands
★ Must-know
Further detail
1. What is the primary role of the nervous system in the body?
2. Which structures together constitute the nerve centers of the nervous system?
3. Which description best defines a neuron?
What is the nervous system?
A rapid communication system connecting all organs through nerve fibers.
What protects the nerve centers?
Three membranes called the meninges.
What is a neuron?
An excitable, stimulable, and information-conducting cell.
How many neurons and glial cells are in the human encephalon?
About 100 billion neurons and 20 times more glial cells.
Nervous system definition - ENGLISH
Rapid communication system linking organs
Encephalon components - ENGLISH
Brain, brainstem, cerebellum
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