KINESIOL 1Y03 Lecture Notes - Lecture 22: Glossopharyngeal Nerve, Brainstem, Cholinergic

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1Y03
• Professor: Krista Howarth

Document Summary

Autonomic nervous system is important for creating reflex loops, and appropriate neural response to maintain homeostasis. Cell body located in cns in motor nuclei of cranial nerves or anterior horn of spinal cord. Autonomic ns: 2-neuron system: pre-ganglionic neuron (always myelinated, synapses with the post-ganglionic neuron), closest to cns. Cell bodies within cns located in autonomic nuclei of the cranial nerves (within brainstem) or in lateral horn of spinal cord: post-ganglionic neuron (always unmyelinated, extends from synapse to the effector tissue) Releases neurotransmitter that can cause either an excitatory response or an inhibitory response (fig 16. 1 textbook) Somatic: neurotransmitter called acetylcholine released in this ns which causes muscle contraction with the neuron synapses with target tissue. Autonomic: pre-ganglionic neuron has cell bodies in the lateral grey horn or brainstem. Also leaves thru ventral root and joins into the spinal nerve. However it will then synapse with the postganglionic neuron at a region called the autonomic ganglion.