YOUR NERVOUS SYSTEM

The Human Body

NERVOUS SYSTEM (Part Ia)

Information-Collection-classification- storage

A system that helps us to learn- work- earn

An overall view
The nervous system is the main information receiving, and instruction sending system of the body.
It receives information and sends out messages through nerves which go to all parts of the body and are the two way communication hotlines.
The central information processing unit (PCU) is the Central Nervous System (CNS) that has two parts, the brain and the spinal cord.

These two are made up of billion of interconnecting nerve cells (neurons).
The input of information is from the sense organ(skin, eye, ears nose) and the output is instruction to muscles to contract(for work and play) .
Face muscles for emotional expression, speech and eye movment.

The sensory and motor nerves are parts of the Peripheral Nervous System (PNS).

THE P N S
This system is the fast track two way message receiving and sending system of the body.
A system of 12 cranial and 31 spinal paired nerves that carry both way messages
Sensory messages from skin to CNS and from CNS. Motor instructions to muscles, the CNS also receives messages from the special senses (hearing, smell, sight and taste).

The sensory system is the information gathering part of the nervous system. This information of the outer world is sent to the brain where it is read classified and stored like in a library.
The information is received by detectors called sensory receptors (there are millions) placed in the skin and they receive information on touch, heat, cold and pain.

Taste, smell, sight and sound are special parts of the sensory systems.

All instruction is sent to the muscles through motor nerves to produce action.

The muscles of the head and face receive instruction through the facial nerve emerging from the brain.

The muscles of the trunk and the limbs receive instruction from the spinal nerves emerging from the spinal cord.
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