Transcript Central Nervous System

Nervous System
 The
body’s primary
communication system
 Consists of neurons
 Made up of 2 parts
Central Nervous System (CNS)
 Made
up of the brain
and
the spinal cord
Spinal cord
 Nerves
that run down the length
of the back
 Information highway
Peripheral Nervous System
 Nerves
branching out from the
spinal cord that connect CNS to
the rest of the body
Somatic Nervous System
 Part
of the PNS
 Controls body’s skeletal
muscles
 Voluntary behaviors
Autonomic Nervous System
 Part
of the PNS
 Controls the glands, and
muscles of the internal organs
 Involuntary behaviors
 2 divisions of this system
Sympathetic Nervous System
 Arouses
the body
 Accelerate heartbeat, slow
digestion, raise blood sugar, cool
you with perspiration, make you
alert and ready
Parasympathetic Nervous System
 Calms
the body
 Conserves energy needed
within the body
 Decrease your heartbeat, lower
blood sugar, etc...
Neuron
A
nerve cell; the basic building
block of the nervous system
Smallest unit of the brain
 Sends and receives messages
throughout the body
3 kinds:
Interneurons
 Located
mainly in the CNS
 communicate internally and
between sensory and motor
neurons
 We have billions of
interneurons
Sensory Neurons
 Located
mainly in the PNS
 carry incoming information
from the sensory receptors to
the CNS
 We have millions of sensory
neurons
Motor Neurons
 Located
mainly in the PNS
 carry outgoing information
from the CNS to the PNS
 We have millions of motor
neurons