BIOL 1412 Lecture Notes - Medulla Oblongata, Proprioception, Muscle Spindle
4 May 2014
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2 neurons to effector (preganglionic + postganglionic) Ans neurons also distinguished by type of nt released a) cholinergic = ach b) adrenegic = norepinephrine (ne) | via sp. nerves ganglion nt = ach nt = ne (except at sweat. * note: to stop chem. stimulation - need to remove nt (fig. Ach broken down by acetyl cholinesterase (ache) On postsynaptic membrane (cell body/dendrites of postsynaptic neuron) Ne broken down by mao (monoamine oxidase) - in synaptic-end bulb of the neuron that released it: parasympathetic ns: (psns0. Cns (cell bodies in brain stem, sacral, sp. cord) O---------------------------- o------------------------ e nt = ach postganglionic ganglion nt = ach. * most organs innervated by ans have both sns + psns - usually have opposite actions. * ans regulates internal processes continuously + automatically eg. heart rate sns excites, psns inhibits (fig. Psns (rest + digest: pupils of eyes (iris muscle, heart, gastrointestinal tract, blood vessels (sm. muscle, sweat glands, digestive glands, genitals.
