Health Sciences 3300A/B Chapter Notes - Chapter 16: Central Nervous System, Axon Hillock, Autonomic Nervous System
6 Jan 2019
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Document Summary
Acetylcholine (ach) a neurotransmitter liberated by many peripheral nervous system neurons and some central nervous system neurons. It is excitatory at neuromuscular junctions but inhibitory at some other synapses. Autonomic motor neurons are both sympathetic and parasympathetic neurons that conduct nerve impulses from the central nervous system to smooth muscle, cardiac muscle, and glands. Autonomic/visceral sensory neurons convey information to the cns from the autonomic sensory receptors, located mainly in visceral organs. Axoaxonic synapses that allow the neuron to move from the presynaptic axon to the postsynaptic axon. Axodendritic synapses that allow neurons to move from the presynaptic axon to the postsynaptic dendrite. Axolemma a plasma membrane that surrounds the axoplasm. Axon the usually single, long process of a nerve cell that propagates a nerve impulse toward the axon terminals. Axon collaterals side branches along the length of an axon that may branch off at a right angle to the axon.
