Chapter 14 - The Autonomic Nervous System Flashcards
Somatic Motor Division - Somatic motor neurons directly innervate ——– muscles, ——- control; acetylcholine (ACh); excitatory/inhibitory?
skeletal muscles
voluntary control
Excitatory
Visceral Motor Division (ANS) - Autonomic motor neurons innervate —— & ——– muscles , and glands; ——- control
Smooth & cardiac
Involuntary Control
2 neurons are involved in Visceral Motor Division
Preganglionic neurons
Postganglionic neurons
——— neuron: Cell body in the PNS autonomic ganglion; axon synapses on the target cell; often ACh and norepinephrine; EXCITATORY & INHIBITORY
Postganglionic neuron
Cell body in the CNS; Synapses on the other ganglionic neuron
Preganglionic neuron
Autonomic Nervous System Divisions
Sympathetic Nervous System
Parasympathetic Nervous System
Sympathetic or parasympathetic where Preganglionic axons are LONG and postganglionic axons are SHORT
Parasympathetic Nervous System
Sympathetic or Parasympathetic where preganglionic axons are SHORT, and postganglionic axons are LONG
Sympathetic Nervous System
——- Division is where cell bodies of preganglionic neurons originate in thoracic and upper lumber spinal cord
Thoracolumbar Division
Sympathetic ganglia are generally near the…
Spinal cord
——- Division is where cell bodies of preganglionic neurons are located within nuclei of cranial nerves in the brainstem and the sacral region of the spinal cord
Craniosacral Division
Parasympathetic ganglia are near or within—-
Target organs
Clusters of neuron cell bodies that house millions of synapses
Ganglia
Actions of the parasympathetic nervous system directly ——– those of the sympathetic nervous system
ANTAGONIZE
Sympathetic neurons ——– heart rate
Increases