Question

6. What are the two parts of the ANS? Where are their respective preganglionic neurons located? What cells give rise embryologically to their postganglionic neurons?

Answer 1

What are the two parts of the ANS? Where are their respective preganglionic neurons located? What cells give rise embryologically to their postganglionic neurons?

Answer: The Nervous system is composed of Two parts:

1. Central Nervous system

2. Peripheral Nervous system

The autonomic nervous system is a type of Peripheral Nervous system.

The autonomic nervous system is composed of the sympathetic( Adrenegric) and parasympathetic( Cholinergic)systems.

The sympathetic portion has its preganglionic neurons located in the intermediate horn of the spinal cord from TI to L2.

The parasympathetic portion has a craniosacral origin with its preganglionic neurons in the brain and spinal cord (S2 to S4). The cranial outflow is carried by cranial nerves III (oculomotor nerve)

VII,(facial nerve)

IX(glossopharyngeal nerve) and

X(vagus nerve).

Postganglionic cell bodies for both systems are derived from neural crest cells.