Nerv06/introduction/position of autonomic ganglia

POINT!

The autonomic ganglia of the sympathetic nervous system is close to the central nervous system. Those of the parasympathetic nervous system is close to (or inside) the organ.

In either the sympathetic (dotted line) or the parasympathetic (solid line) nervous systems, the axon of the neuron leaving the central nervous system, changes the neuron once before innervating the effector. The synapse between these two neurons is called the (autonomic) ganglion. The (black-colored) neuron from the central nervous system to the the (autonomic) ganglion is called the pre-ganglionic neuron. The (pink-colored) neuron from the (autonomic) ganglion to the effector, is called the post-ganglionic neuron. The axons of the pre-ganglionic and post-ganglionic neurons are respectively the pre- and post- ganglionic fibers.

The representative ganglia of the sympathetic nervous system is the sympathetic trunk. The sympathetic trunk locates on both sides of the spinal cord. The ganglia of the para-sympathetic nerves often locates inside (or close to) the innervated organs.

Challenge Quiz

1.

Inside the sympathetic trunk is the cell body of the sympathetic pre-ganglionic.post-ganglionic  正解! neuron.

2.

Inside the sympathetic trunk is the nerve ending of the sympathetic pre-ganglionic. post-ganglionic  正解! neuron.

3.

The sympathetic ganglion is often in the innervating organ.sympathetic trunk  正解!.

4.

The para-sympathetic ganglion is often in the innervating organ. sympathetic trunk  正解!.

5.

In the sympathetic nerve, the pre-ganglionic fiber is long and the post-ganglionic fiber is short.pre-ganglionic fiber is short and the post-ganglionic fiber is long  正解! 。

6.

In the para-sympathetic nerve, the pre-ganglionic fiber is long and the post-ganglionic fiber is short. pre-ganglionic fiber is short and the post-ganglionic fiber is long  正解! 。