Autonomic Nervous System Flashcards
What is the role of the autonomic nervous system?
Maintains body homeostasis - blood flow, blood pressure, GI secretion, temperature
Where do parasympathetic neurons originate from?
Craniosacral region
Where do sympathetic neurons originate from?
Thoracolumbar region
What is the relative length of parasympathetic fibres?
Preganglionic = long Postganglionic = short
What is the relative length of sympathetic fibres?
Preganglionic = short Postganglionic = long
Where are parasympathetic ganglia (close/far)?
Close to organ
Where are sympathetic ganglia (close/far)?
Further from organ - in sympathetic trunk
How many ganglion in sympathetic trunk?
23
Where is the sympathetic trunk?
Next to vertebrae in thoracolumbar region
What is the path of a sympathetic pre-ganglionic neuron?
Lateral horn of spinal cord –> ventral root –> white rami communicantes –> ganglion
Preganglionic sympathethic fibres enter/exit the sympathetic trunk via the white/grey rami communicantes? What is the myelination?
Enter, white, lightly myelinated
Postganglionic sympathethic fibres enter/exit the sympathetic trunk via the white/grey rami communicantes? What is the myelination?
Exit, grey, no myelination
Cholinergic fibres release _________
ACh
Preganglionic parasympathetic fibres enter/exit the sympathetic trunk via the white/grey rami communicantes? What is the myelination?
Don’t pass through! Go through ventral ramus
Adrenergic fibres release __________
NE
