What is the nervous system?
A rapid communication system connecting all organs through nerve fibers.
Nervous system definition - ENGLISH
Rapid communication system linking organs
What protects the nerve centers?
Three membranes called the meninges.
Encephalon components - ENGLISH
Brain, brainstem, cerebellum
What is a neuron?
An excitable, stimulable, and information-conducting cell.
Types of nerves - ENGLISH
Sensory, motor, or mixed; 12 cranial, 31 spinal pairs
How many neurons and glial cells are in the human encephalon?
About 100 billion neurons and 20 times more glial cells.
Nerve protection membranes - ENGLISH
Meninges (three layers) protect nerves
Neuron structure - ENGLISH
Dendrites, cell body, axon, myelin sheath, terminals
Glial cells - ENGLISH
Support, nourish, and protect neurons
Reflex behavior - ENGLISH
Involuntary movement response to stimulus
Test your knowledge with 7 questions on Reflex Behaviors and Nervous System.
1. What is the primary role of the nervous system in the body?
2. What is the primary function of the nervous system?
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