Nervous System
Objectives:
Differentiate the
functions of
the sympathetic
and
parasympathetic
divisions of ANS
Identify
dendrites,
cell body,
axon of a
neuron
Students
will be
able to:
Compare the
location and
functions
of central and
peripheral
nervous
systems
Differentiate
the structure
and function
of a motor
and sensory
neuron
INTRODUCTION
Nervous system is the chief controlling
and coordinating system of the body.
It controls and regulates all voluntary
and involuntary activities of human
body.
There are three characteristic
properties of nervous system of human
body: Sensitivity, Conductivity
and Responsiveness
Function
Nervous System
Unit of Nervous
System
Division
Main parts
Central Nervous
System
Encephalon
Interesting Facts
Peripheral Nervous
System
Sense Organs
Autonomic
Nervous System
Spinal Cord
Cranial and
Spinal Nerves
Somatic
Nervous
System
Sympathetic
Nervous System
Parasymphatetic
Nervous System
Control
Regulate
Communicate
Mental activity center:
Learning
Memory
Homeostasis
The nervous system is made of:
The encephalon
**The nerves
The spinal cord
The senses
Nervous System is divided in:
Central Nervous System
The Central
Nervous System
controls everything
in the body.
It contains the
nerves of the
encephalon and
spinal cord
Encephalon
The Encephalon has three main parts:
1. The Cerebrum
2. The Cerebellum
3. The Brainstem
Areas and lobs of the cerebrum
.
The brain
The Brain Stem
connects:
The spinal
cord.
heartbeat
The nerves in
the brainstem
control your:
breathing
blood pressure
All parts of the
nervous system
lying outside the
brain and spinal
cord.
It carry messages
between the central
nervous system and
the rest of the body.
It is an automatic
System
Body’s
activities
that you
don’t think
about.
Heartbeat
It
controls:
Breathing
controls
Activities in
your small
intestine
Cranial
Nerves
and
Spinal
Nerves
Cranial nerves
Humans have 12 pairs
of cranial nerves
(sensory/motor/mixe
d) which control the
head, face, neck,
shoulders
Except VAGUS nerve –
controls internal
organs
Somatic nerves
control skeletal
muscles, bones,
and skin.
Sensory
neurons
Mixed Neuron
Motor neurons
Carry impulses from pain
receptors in the skin to the
central nervous
system (brain and spinal cord)
Carry impulses from CNS
to effectors muscles to
make movement
through the secretion of a
hormone.
Human have 31 pairs of
spinal nerves (mixed)
which take impulses to
and from the spinal
cord
The peripheral nervous system is made of
the senses organs, those organs are:
The eye is one of
your sense
organs.
The eye
gathers
pictures and
sends them
to the brain.
The eye is
made of the
iris and the
pupil.
Vision is
your
ability to
see.
Vision
involves
the eye
and the
brain.
Hearing starts
when some of
the sound waves
go into the ear.
When a sound is
made, the air
around the
sound vibrates.
The nerves in
the skin allow
us to feel
texture,
pressure, heat,
cold, and pain.
The nose
controls your
sense of
smell.
The nose is able
to smell 80
different kinds of
smells
Mouth and TASTE
Your sense of
taste comes from
the taste buds in
the tongue.
Taste buds are
the parts on the
tongue that allow
us to taste.
The four kinds of
taste buds are
sweet, sour, bitter,
and salty.
Autonomic nerves control the
muscles of the glands and
internal organs which we can’t
control
Sympathetic
components
Work in
conjunction/opposition to
each other
Parasympathetic
components
The “funny
bone” is the
only place on
the arm where
a nerve is not
protected.
THANK YOU 