theneuron - Biology 3201 Unit 1 Maintaining Dynamic...

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Biology 3201 Unit 1 – Maintaining Dynamic  Equilibrium II Section 1 – Nervous System “The Neuron”
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The Neuron The basic functional unit  of the nervous system. Function:  Send impulses  to and from the CNS and  PNS and the effectors  (muscles/glands)
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Neuron Structure
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Dendrite    Fine hair-like extensions on the end of a neuron. Function : receive incoming stimuli. Cell Body or Soma    The control center of the neuron.  Function: Directs impulses from the dendrites to the axon.  Nucleus    Control center of the Soma.  Function: Tells the soma what to do. Axon  Pathway for the nerve impulse (electrical message) from the  soma to the opposite end of the neuron. Myelin Sheath    An insulating layer around an axon. Made up of  Schwann cells. Nodes of Ranvier    Gaps between schwann cells.  Function: Saltatory Conduction (Situation where speed of an  impulse is greatly increased by the message ‘jumping’ the gaps  in an axon).
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Types of Neurons There are 3 types of neurons. 1. Sensory Neurons     Neurons located near  receptor   organs (skin, eyes, ears). Function:
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This note was uploaded on 05/04/2009 for the course BIO BIO124 taught by Professor Allen during the Spring '09 term at Middlesex CC.

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theneuron - Biology 3201 Unit 1 Maintaining Dynamic...

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