Somatic Motor Efferent division.
-One neuron between CNS and effector
-Cell body in spinal cord (CNS)
-Axon in spinal nerves (PNS)
-Axon is myelinated
Somatic Motor efferent division (synapse).
-Neurotransmitter = Acetyl-choline
-Released at the neuromuscular junction
Autonomic nervous system.
-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
Autonomic nervous system (effectors).
-Adipose (fat) tissue
Sympathetic chain ganglia.
Also known as the sympathetic trunk.
Usually 22 sympathetic chain ganglia on either side of the vertebral column.
Autonomic nervous system- sympathetic
-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.
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
Sympathetic nervous system
-Increased heart rate.
-Constricting blood vessels to skin and viscera.
-Increased blood flow to muscles.
-Decreased gastric motility.
-Increase in sweating.
Parasympathetic nervous system
-Decreased heart rate.
-Increased gastric motility.
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.