Anatomy Autonomic Nervous System

differnce between somatic NS and autonomic NS

SNS: one neuron to skeletal muscle

ANS: two nuerons to cardiac, smooth muscle, galnds, and fat cells

Sypathetic division

fight or flight response, increase in body productions

Parasympathetic

rest and digest, decrease in body productions but increase in digestion

Thoracolumbar divison

sympathetic, norepinephrine/epinephren, short preganglionic and long postganglionic

Pathways of pregnaglionic neurons

1. synpase with a postganglionic at the ganglion

2. synpase at a lower or higher gangliom

3. pass through without synpasing→ splanchnic nerves

destination of sympathetic ganglia

1. rejoin spinal nerves

2. symaptheic nerves, carotid plexus

3. spalnic nerves, form collateral ganglia

craniosacral division

parasympathetic, long preganglionic and short postganglionic, acetylcholine

cholinergic fibers

neurotransmitter: acetylcholine

muscraine receptors

recpetors on effector organ

nicotinic receptor

receptors on postganglionic neurons

adrenergic receptors

neurotransmitter: norepinephrine, found only in sympathetic post ganglionic neurons

a adrenergic receptors

contractions of everywhere but the heart

b adrenergic receptors

excitation of the heart