IV. NERVOUS TISSUE

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LOCATED IN THE BRAIN, SPINAL CORD AND NERVES.
CONTAINS 2 MAJOR CELL TYPES:

1. NEURONS-HIGHLY SPECIALIZED CELLS THAT GENERATE AND CONDUCT NERVE IMPULSES.
2. NEUROGLIAL CELLS- NONCONDUCTING, SUPPORTING CELLS THAT INSULATE AND PROTECT NEURONS.
 
 

1.  NEURONS

FIG 1:  DIAGRAM OF A NEURON

Below is a slide of this neuron.

 
FIG 2:  NEURON

Notice the large cell body of the neuron and the processes that extend from that body.  The nucleus is very evident here.  Do you know the function of an axon? a dendrite?
Do you know the most important function of a neuron?

 

 
 
 
 
 
 
FIG 3:  NEUROMUSCULAR JUNCTION

In this slide you can see the junction between an axon and a muscle cell.

 
 
 
 
 
 
 
 
FIG 4:  NODE OF RANVIER

The Node of Ranvier is the area along an axon that is nonmyelinated.  It is the place where Schwann cells do not touch.  It is here at the nodes that axon collaterals can emerge from the axon.

 
 
 
 
 

2.  NEUROGLIAL CELLS

FIG 5:  MICROGLIAL CELL

THIS IS A SLIDE OF A NEUROGLIAL CELL CALLED A MICROGLIUM.

 
 
 

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