Autonomic Nervous System Flashcards
Autonomic
- involuntary control of 2 neuron pathway.
- associated ganglia
- use of Ach, or norepinephrine.
- thin axons= slow conduction
- pathways at one organ tend to counter the other.
components of the ABD aortic plexus
- celiac plexus
- superior mesenteric plexus
- inferior mesenteric plexus
- contains PREvertebral ganglia
Hypogastric plexus
innervates and controls urinary and reproductive function.
Cholinergic Effect
- release of Ach
- PS division: acts on pre-/postganglionic axons
- S division: preganglionic axons
Adrenergic Effect
- release of norepinephrine.
2. S division: acts on postganglionic axon
Walk me through the micturation reflex pathway.
controlled by autonomic reflexes.
Splanchnic Nerve
terminate in the prevertebral ganglia (anterolateral wall of aorta)
- does not have synapse occur.
- is myelinated.
Sympathetic Splanchnic Nerves
- Greater thoracic splanchnic
- Lesser thoracic splanchnic
- Least thoracic splanchnic
- Lumbar splanchnic
- Sacral splanchnic
Describe prevertebral ganglia
- single, unpaired structure.
- only contained in abdominopelvic cavity
- celiac, superior and inferior mesenteric ganglia
explain the postganglionic sympathetic nerve pathway
- synapse in trunk, to the grey rami, then directly to the organ.
Explain the splanchnic nerve pathway.
1.enter trunk via white rami, no synapse, drops down 1+ levels, descends splanchnic nerve, synapses in prevertebral area.
Explain the adrenal medulla pathway.
enters parasympathetic trunk via white rami, then straight to the suprarenal glands. no synapses before reaching the organ.
Somatic System
- voluntary and controls single neuron pathway. 2. no ganglia associated. 3.motor to skeletal muscle. 4.ONLY Ach used. 5. Myelination=fast conduction.
What axons release Ach?
pre/postganglionic of parasympathetic, and perganglionic axons of the sympathetic division.
Norepinephrine is released by what axon?
postganglionic of sympathetic division.
