Branches of the Autonomic Nervous System

PSNS

Bronchoconstriction

SNS

Bronchodilation

PSNS

Decreases (indirect effect only) metabolic rate.

PSNS

Decreases heart rate contraction.

SNS

Increases heart rate and force of contraction.

SNS

Increases metabolic rate.

SNS

Inhibits digestive and urinary functions.

Parasympathetic Nervous System (PSNS)

Main function is to control the bodies response which at rest (Rest and recovery role) which promotes functions associated with digestion, defecation, and urine production. The cell bodies of the neurons are located in the cranial nerve nuclei, and the sacral portion of the spinal cord. Neurotransmitter is acetylcholine.

Sympathetic Nervous System (SNS)

Main function is to control the body's response during a perceived threat (fight or flight). The cell bodies of the neurons are located in the lumbar and thoracic regions of the spinal cord. Neurotransmitters are norephinehrine, epinephrine, and acetylcholine.

PSNS

Pupil constriction.

SNS

Pupil dilation.

PSNS

Stimulates digestive and urinary functions.

PSNS

Vasoconstriction (indirect effect only) of blood vessels to the skeletal muscle.

SNS

Vasoconstriction of blood vessels to abdominal organs and skin.

PSNS

Vasodilation of blood vessels to abdominal organs and skin.

SNS

Vasodilation of blood vessels to skeletal muscle.