PNS + SNS Flashcards
“Rest + Digest” Nervous System
Parasympathetic NS
“Fight + Flight” Nervous System
Sympathetic NS
SNS: Eye
Lifts eyelid
Dilates pupil
PNS: Eye
Constricts ciliary muscles (lens)
Constricts pupil
Accommodation
SNS: Salivary Glands
INHIBITS secretions
IP3 + DAG-mediated 2ndary messengers
PNS: Salivary Glands
INCREASED secretions
cAMP-mediated 2ndary messengers
SNS: Lungs
DILATES airways
PNS: Lungs
CONSTRICTS airways
CN X
SNS: Heart
INCREASE HR and contractile force
Increased CO
PNS: Heart
DECREASE HR and contractile force
Lowered CO
CN X
SNS: Stomach
DECREASE acid secretions
DECREASE peristalsis/motility
INCREASE sphincter tone
Celiac ganglion
PNS: Stomach
INCREASE acid secretion
INCREASE peristalsis/motility
DECREASE sphincter tone
CN X
SNS: Sweat Glands
Sweating STIMULATION
PNS: Sweat Glands
N/A
SNS: Urinary Bladder
Relax
PNS: Urinary Bladder
Constrict
SNS: Adrenal Medulla
Increased secretions
Direct innervation by preganglionic neurons on nicotinic receptors in medulla
PNS: Adrenal Medulla
N/A
SNS: Blood Vessel Tone
Abdomen/Skin: alpha + beta –> constriction
Skeletal Muscle: alpha –> constrict, beta –> dilate
PNS: Blood Vessel Tone
N/A
PREganglionic PNS:
Neurotransmitters + receptors
ACh + Nicotinic
POSTganglionic PNS:
Neurotransmitters + receptors
ACh + muscarinic
Somatic:
Neurotransmitters + receptors
ACh + nicotinic (skeletal muscle)
PREganglionic SNS:
Neurotransmitters + receptors
ACh + Nicotinic
