Transmission at the synaptic junctions between preganglionic and postganglionic neurons and between the postganglionic neurons and the autonomic effectors are chemically mediated. The principal transmitter agents involved are acetylcholine and norepinephrine.
The parasympathetic division is also known as the craniosacral division of the autonomic nervous system because preganglionic neurons are located in several cranial nerve nuclei (III, VII, IX, and X) and in 2, 3,...
The sympathetic nervous system makes up part of the autonomic nervous system, It is also known as the involuntary nervous system. It can regulate important bodily functions such as heart rate, blood pressure, pupil...
Nervous system consists central nervous system (Brain and Spinal cord), the peripheral nervous system (Cranial nerves and Spinal nerves), Autonomic nervous system (Sympathetic nervous system and parasympathetic nervous system).
