• Basic unit of the nervous system

• Each section of the NS is a collection of neurons

• Every neuron has a: cell body, nucleus, axon, dendrites, axon terminals, and a myelin sheath.

• Info comes in at the dendrites and is passed on by neurotransmitters at the axon terminal.

(Draw the 3 types on neurons from the PP)

Sensory (afferent) neurons:

• Carry sensory information from the extremities and internal organs to the brain. Receive stimuli from environment and relay that info to the brain.

Association Neurons:

• Found in the CNS and link motor and sensory neurons. Commonly used in reflex arcs.

Motor (efferent) neurons:

• Carry messages from brain to target organs, tissues, or cells, to evoke a response to the stimulus (cause the body to react to information).

• Response of the NS is quick-acting and short-lasting.

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Year 11 Unit 2