1 A key function of nicotinic receptors is to trigger rapid neural and neuromuscular transmission. 2  Nicotinic receptors are found in: 3  The somatic nervous system (neuromuscular junctions in skeletal muscles).4  The sympathetic and parasympathetic nervous system (autonomic ganglia).icotinic receptors are found in which of the following locations: (Choose ONE best answer). A. Sympathetic nervous system. B. Parasympathetic nervous system. C. Central nervous system. D. All of the above. E. None of the above. Answer: To review relevant content, see Locations of Nicotinic Receptors in this section.