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Nervous System
PNS and ANS
Neuron
 Cells of the nervous system, called nerve cells or neurons,
carry "messages" through an electrochemical process
The Nervous System
 is divided into:
 The Central Nervous System
and the Peripheral Nervous
System
 The nervous system of an
animal coordinates the activity
of the muscles, monitors the
organs, stops input from the
senses, and initiates actions
Central Nervous System
 central nervous system consists
of: the brain and the spinal
cord
 The average adult human
brain weighs approximately 3
pounds
 The brain contains about 100
billion nerve cells (neurons
 Spinal cord is the vehicle for
transportation of information
Peripheral Nervous System



1.
is divided into two major
parts: the somatic nervous
system and the autonomic
nervous system
Somatic Nervous system=
sends sensory information to
the skeletal muscle
The autonomic nervous
system controls smooth
muscle
"fight" or take "flight" (run
away)
Meningitis
 There are several layers of tissue
that separate your brain from the
outside world.
 First, there is your skin (scalp).
Beneath the skin is bone (your
skull). Below the skull are three
special coverings called the
meninges
 Meningitis is an infection of the
meninges.
 The Coverings of the
Brain