BIOLOGY 3U03 Chapter Notes - Chapter 3: Erectile Tissue, Vagus Nerve, Propranolol
4 Feb 2017
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Autonomic nervous system (chapter 60: parasympathetic nervous system (psns) Most ganglia lie in or close to effector organs. Vagus nerve (x) great importance innervates almost all organs while others just go to. Few interconnections at level of ganglia precise responses. Final neurotransmitter = always acetylcholine (ach) other parts of the brain: sympathetic nervous system (sns) Associated with defensive, aggressive & exercise functions (fight-or-flight) Most ganglia lie close to spinal cord, in para-vertebral chains. Many interconnections at level of ganglia (cid:862)(cid:271)lanket(cid:863) responses. Simple autonomic reflexes from visceral afferent information may be integrated in the spinal cord, but most. Ans outflow receives input from higher centers & integration in the brain. In general sns & psns exhibit central antagonism as well as peripheral antagonism. Ad, nad, and dopamine (da) are the 3 naturally occurring catecholamines derived from tyrosine (phenylalanine) Blood flows from adrenal cortex to adrenal medulla, carrying glucocorticoids (cortisol, etc. )
