Transcript THE NERVOUS SYSTEM I

THE NERVOUS SYSTEM I
pp. 1003-1015
FUNCTION
• network of cells (neurons)
that communicate and
control the body through
electrical impulses
• Includes neurons (cells that
carry messages), brain and
spinal cord
NEURONS
CENTRAL NERVOUS SYSTEM
CNS
• Brain – control center
with different sections
controlling different
parts of the body
• Spinal cord – column of
nerve tissue that acts as a
communication link
between brain and
Peripheral NS.
PERIPHERAL NERVOUS SYSTEM
PNS
• Carries impulses to and
from the CNS.
• Motor division (reacts to
sensory input)
1. Somatic nervous system
(voluntary): transmits
impulses to and from
skeletal muscle
(including reflexes)
2. Autonomic nervous system (involuntary) –
controls glands, internal organs, and other
smooth muscle tissue
(EX. Parasympathetic and sympathetic
response)
TYPES OF NEURONS
• sensory – sense organs/receptors send
stimulus to CNS to process.
• motor – sends response from CNS to
muscles/glands to react.
• interneurons – connect sensory and
motor and carry impulses between
them.
REFLEXES
• Sensory information
does not need to be
processed by the
brain
• During a reflex the
information is
processed in the
spinal cord