Autonomic nervous system(ANS)

The autonomic nervous system(vesceral nervous system) control system functioning largely below the level of consciousness,
it regulates the activities of cardiac muscle, smooth muscle, and glands.
Responsible for “involuntary” control the function of :
? Cardiovascular (Regulate heart rate and blood poresure)
? Respiratory (Regulate respiratory rate)
Digestive(Regulate the motility)
? Urinary
? Reproductive functions
? Key role in the bodies response to stress
In general, nerve impulses from one division of the ANS stimulate an organ to increase its activity (excitation), and another division inhibit the organ activity (inhibition).
SYMPATHETIC NERVOUS SYSTEM:
?Allow body to function under stress
?Fight or flight
PARASYMPATHETIC NERVOUS SYSTEM
?Maintenance functions
?Rest-and-digest
?Counterbalances sympathetic function
Almost all visceral organs are served by both divisions, but they cause opposite effects
Structures of ANS includes:
1. autonomic sensory neurons (afferent)
2. integrating centers in the CNS
3. autonomic motor neurons (efferent):
a- preganglionic neurons (type b)
b- autonomic ganglia
c- postganglionic neurons (type c)