The sense of touch originates from numerous nerve endings located in the dermis layer of skin. These nerve endings detect sensations like pressure, pain, heat and cold and send signals to the brain via the spinal cord. Different areas of the body contain more or fewer nerve endings, making some regions like the fingertips and tongue highly sensitive to touch. The primary role of pain receptors is to protect the body by warning the brain of potential injuries.

2.  the
faculty by which
external objects or forces
are perceived through
contact with the body

3. 
While your other four senses (sight, hearing,
smell, and taste) are located in specific parts of
the body, your sense of touch is found all over.
This is because your sense of touch originates
in the bottom layer of your skin called the
dermis. The dermis is filled with many tiny
nerve endings which give you information
about the things with which your body comes
in contact. They do this by carrying the
information to the spinal cord, which sends
messages to the brain where the feeling is
registered.

4. 
The nerve endings in your skin can tell
you if something is hot or cold. They can
also feel if something is hurting you.
Your body has about twenty differnt
types of nerve endings that all send
messages to your brain. However, the
most common receptors are heat, cold,
pain, and pressure or touch receptors.
Pain receptors are probably the most
important for your safety because they
can protect you by warning your brain
that your body is hurt!

6. 
Some areas of the body are more sensitive than
others because they have more nerve endings.
Have you ever bitten your tongue and wondered
why it hurt so much? It is because the sides of your
tongue have a lot of nerve endings that are very
sensitive to pain. However, your tongue is not as
good at sensing hot or cold. That is why it is easy
to burn your mouth when you eat something
really hot. Your fingertips are also very sensitive.
For example, people who are blind use their
fingertips to read Braille by feeling the patterns of
raised dots on their paper. To learn more about
Braille, click on the word "Braille" located on the
left-hand side of this page

7. 
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You have more pain nerve endings than any
other type.
The least sensitive part of your body is the
middle of your back.
The most sensitive areas of your body are your
hands, lips, face, neck, tongue, fingertips and
feet.
Shivering is a way your body has of trying to
get warmer.
There are about 100 touch receptors in each of
your fingertips.
Rattlesnakes use their skin to feel the body heat
of other animals.

8. 
Generically your sense of touch can be
impaired in three areas:
1.peripheral nerves(diabetic or
alcoholic neuropathy
2.spinal cord(paraplegia, herniated disc)
3.brain(stroke, brain tumor)
Pain, temperature, light touch, proprioception
and vibratory sense all may be taken away in
the above to varying degrees.