KINESIOL 1A03 Lecture Notes - Lecture 15: Prevertebral Ganglia, Sympathetic Ganglion, Paravertebral Ganglia

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1A03
• Professor: Krista Howarth

Document Summary

In most autonomic motor pathways, two motor neurons are in series. 1st neuron has its cell body in the cns, myelinated axon extends from the cns to the autonomic ganglion collection of neuronal cell bodies in the pns. Cell body of the 2 nd neuron is also in that same autonomic ganglion. Unmyelinated axon extends directly from the ganglion to the effector. 1st motor neuron extends to specialized cells called chromaffin cells in the adrenal medullae rather than an autonomic ganglion. All somatic motor neurons release only acetylcholine but autonomic motor neurons release either ach or norepinephrine. The output (motor) part of the ans has two divisions: Parasympathetic division rest and digest : activities conserve and restore body energy during times of rest or digesting a meal; conserves energy and replenishes nutrient stores. Most organs have dual innervations receive impulses from both sympathetic and parasympathetic neurons. All sympathetic and parasympathetic preganglionic neurons release acetylcholine.