PSL300H1 Lecture Notes - Lecture 30: Autonomic Nervous System, Postganglionic Nerve Fibers, Sympathetic Nervous System
Document Summary
Sympathetic/parasympathetic pathway: autonomic reflexes, autonomic control centers. Autonomic, and involuntary - thought to be separate from somatic control. This is actually inseparable from the voluntary control. Internal organs, blood flow, smooth muscles of eye, viscera, and related parts. Maintaining body homeostasis by working with endocrine and behavioural state systems. Can anticipate stimulus, such in salivary glands or react quickly for homeostasis. Also deals with exercise (blood flow, heart rate), emotion, effects of gravity, eating - aka more than just emergencies. Preganglionic: cell bodies located in cns, either in brainstem or spinal cord. Axons project to ganglia (postganglionic neuron) between cns and target tissue. Are located in autonomic ganglia, which is between the cns and target tissue postganglionic axons project to the target tissue. Note: ganglia are groups of cell bodies outside of the cns. Both sympathetic systems release ach onto nicotinic receptors. Most postganglionic sympathetic secrete norepinephrine onto adrenergic receptors. Most postganglionic parasympathetic secrete ac onto muscarinic receptors.
