Question

The parasympathetic NS is characterized by a craniosacral distribution of parasympathetic neurons. What is the distribution of parasympathetic neurons in the parasympathetic NS?

1) Thoracolumbar
2) Cervical
3) Sacral
4) Lumbar

Answer 1

The distribution of parasympathetic neurons in the parasympathetic NS is craniosacral, with preganglionic neurons in the brain stem and sacral spinal cord.

Step-by-step explanation:

The distribution of parasympathetic neurons in the parasympathetic nervous system (NS) is characterized as craniosacral.

This means that the preganglionic neurons are located in the brain stem and the sacral region of the spinal cord. The postganglionic neurons are typically located very close to the target organs, and they release neurotransmitters such as acetylcholine and sometimes nitric oxide onto the target organs to promote rest-and-digest activities.