1. As a result, the postsynaptic parasympathetic nerve fibers are very short. 2. Pupil size is therefore under the dual control of sympathetic and parasympathetic nerves . 3. ACh is secreted by parasympathetic nerve fibers of both the short and long reflex pathways. 4. Incoming parasympathetic nerve fibers form synapses with the dendrites of nerve cells within the ganglion. 5. Although such pacemaker potentials have a parasympathetic nerves . 6. The gland receives parasympathetic nerve supply from the superior laryngeal nerve and the recurrent laryngeal nerve. 7. This toxin contains histamine, serotonin and acetylcholine, the last of which causes powerful stimulation of the parasympathetic nerve system. 8. The enteric nervous system is independent but is connected to the central nervous system by sympathetic and parasympathetic nerves . 9. As shown in the chart above, methoctramine binds preferently to M2 receptors, found mostly in the parasympathetic nerves and atria. 10. Three spinal nerves in the sacrum ( S2-4 ), commonly referred to as the pelvic splanchnic nerves, also act as parasympathetic nerves .
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