Passage of nerve messages >>>

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Passage of nerve messages >>> Neurone structure Nerve messages Motor and Sensory nerves http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/human/thenervoussystemrev1.shtml

Neuron structure

Myelinated Neurones The axons of many neurones are encased in a fatty myelin sheath. Babies are born with a very thin sheath and are unable to co-ordinate movement Where the sheath meets the next, the axon is unprotected.

Neuron Structure

Nerve impulses Neurones send messages electrochemically – this means that chemicals cause an electrical impulse. Chemicals in the body are ‘electrically charged’ when they have an electrical charge, they are called ions.

Types of nerves… Sensory nerves send messages to the brain and generally connect to the brain through the spinal cord inside your backbone. Motor nerves carry messages back from the brain to all the muscles and glands in your body

Sensory nerve

Motor nerve

Message direction Afferent Neurones - Also known as sensory neurones, these are specialised to send impulses towards the CNS away from the peripheral system Efferent Neurones - These nerve cells carry signals from the CNS to the cells in the peripheral system

To aid understanding.. http://www.youtube.com/watch?v=iBnGeDzTY D4 Apologies; American accent warning http://www.youtube.com/watch?v=XgIaAs_ON G4 This one is a fun explanation! http://www.youtube.com/watch?v=owZNPmxZ PeU