Nervous system

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created 8 years ago by ninjamoose
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1

Somatic Motor Efferent division.

-Voluntary control
-One neuron between CNS and effector
-Cell body in spinal cord (CNS)
-Axon in spinal nerves (PNS)
-Axon is myelinated

2

Somatic Motor efferent division (synapse).

-Neurotransmitter = Acetyl-choline
-Released at the neuromuscular junction

3

Autonomic nervous system.

-Involuntary control
-2 neurons between CNS and effector
-Neuron #1 has cell body in CNS and axon in PNS
-Neuron #2 has cell body and axon on PNS

4

Autonomic nervous system (effectors).

-Smooth muscle
-Cardiac muscle
-Glands
-Adipose (fat) tissue

5

Sympathetic chain ganglia.

Also known as the sympathetic trunk.
Usually 22 sympathetic chain ganglia on either side of the vertebral column.

6

Autonomic nervous system- sympathetic
(post-ganglionic neurons).

-Most are unmyelinated
-Longer than pre-ganglionic neurons.
-Dendrites and cell bodies in sympathetic chain ganglia or collateral ganglia.
-Synapse on effector organ.
-Releases acetyl-choline or noradrenaline.

7

Autonomic nervous system- sympathetic (pre-ganglionic neurons).

-Dendrites and cell bodies within lateral grey horns of thoracic segments of the spinal cord.
-Shorter than post-ganglionic neurons.
-Synapse in autonomic ganglion
-Releases acetyl-choline
-Myelinated.

8

Sympathetic nervous system

-Increased heart rate.
-Constricting blood vessels to skin and viscera.
-Increased blood flow to muscles.
-Decreased gastric motility.
-Decreased salivation.
-Pupil dilation.
-Increase in sweating.

9

Parasympathetic nervous system

-Decreased heart rate.
-Increased gastric motility.
-Pupil constriction.
-Increased salivation.

10

Autonomic nervous system- Parasympathetic (pre-ganglionic neurons).

-Cell bodies in nuclei in brain stem or in lateral grey columns if the sacral cord.
-Axons are in cranial nerves or pelvic nerves.
-Synapse onto parasympathetic post-ganglionic neuron.
-Release acetyl-choline.