,The nervous system
Spec the divisions of the :
nervous system
:
Central and peripheral (Somatic and
autonomic
nervous
System
: The nervous system is a specialised network of
consists of the central cells in the human body t is our
primary
and peripheral nervous internal communication It is based
System .
systems , communicates on electrical + Chemical Signals .
It has two
using electrical signals. main functions :
central nervous system 1) to :
collect , process + respond to information
consists of the brain in the environment
and the Spinal cord 2) to Co-ordinate the
working of different
t is the
origin of all
organs
+ cells in the body.
complex demands + The nervous system is divided into two sub-
decisions. Central nervous
Systems system
:
·
peripheral nervous peripheral nervous system .
sends info to
system
:
the CNS from the The central nervous system :
outside world + The CWS is made up of the brain and the Spinal Lord :
transmits messages The brain is the of all conscious awareness. The brain's outer layer the
·
centre ,
from CNS 3mm thick the brain like an
the to Cerebral contex , is
only + covers orange peel It is
.
muscles glands only found in mammals The brain
highly developed in humans , which is what
+ in . is
the body
. distinguishes higher mental functions. The brain is divided into two hemispheres.
Somatic nervous
·
The Spinal cord is an extension of the brain . It passes messages to from the
system : transmits brain + connects nerves to the PNS It . is also responsible for reflex actions.
into from receptor cells
in the sense
organs toThe peripheral nervous
system :
the CNS It also The PNS transmits of to from the central nervous
.
Signals Vice millions neurons +
receives information
system. The peripheral nervous
system is further subdivided into :
from the CNS that autonomic nervous
system governs
:
vital functions in the body such by
breathing
directs muscles to act .
Somatic nervous system governs : muscle movement + receives information from
autonomic nervous
sensory receptors.
system : transmits
information to + from
internal
boskily organs,
operating involuntarily
I has two main
divisions : the
sympathetic
and
parasympathetic
nervous
systems.