Difference Between Sympathetic And Parasympathetic Nervous System MCQ - Practice Questions with Answers

Sympathetic Neural System & Parasympathetic Neural System

Sympathetic Neural System:

• The sympathetic neural system can be simplified into the following components:

                      Preganglionic fibres
                      Collateral Ganglia
                      Postganglionic fibres

• Preganglionic fibres are the axons of the neurons that are present in the spinal cord. 
• Most preganglionic fibers of the sympathetic division arise from the middle, or thoracic-lumbar portion (T1 to L3) of the spinal cord 
• Thus Sympathetic is also termed as Thoraco-Lumbar outflow
• The preganglionic fibres almost immediately terminate in ganglia that lie near the cord. Therefore, in this division, the preganglionic fiber is short.
• There are three collateral ganglia situated in the abdominal cavity. 
• Post ganglionic fibres make contact with the organs and are longer. 
• Preganglionic nerve fibres are cholinergic (filled with acetylcholine). 
• Post ganglionic nerve, fibres are adrenergic (filled with noradrenaline) except sweat gland which have cholinergic postganglionic nerve fibres.

Parasympathetic Neural System:

• The preganglionic nerve fibres arise from cranial nerves 3, 7, 9, 10 and sacrum. Thus it is termed as Cranio-sacral outflow
• Preganglionic nerve fibres are longer than postganglionic nerve fibres.
• Both pre and post ganglionic nerve fiber are cholinergic.
   

Comparison Between Sympathetic and Parasympathetic Neural System