where is acetylcholine released in the sympathetic nervous system
Acetylcholine At a schematic level, the sympathetic and parasympathetic nervous systems are both organized in essentially the same way: preganglionic neurons in the central nervous system send projections to neurons located in autonomic ganglia; these neurons then send output projections to virtually every tissue of the body. In both branches the internal connections—the projections from the central nervous system to the autonomic ganglia—use acetylcholine as neurotransmitter, and the receptors it activates are of the nicotinic type. In the parasympathetic nervous system the output connections—the projections from ganglion neurons to tissues that don't belong to the nervous system—also release acetylcholine, acting on muscarinic receptors. In the sympathetic nervous system the output connections mainly release noradrenaline, although acetylcholine is released at a few points, such as the sudomotor innervation of the sweat glands.
Sympathetic nervous system In the sympathetic nervous system and other components of the peripheral nervous system, these synapses are made at sites called ganglia. The cell that sends its fiber is called a preganglionic cell, while the cell whose fiber leaves the ganglion is called a postganglionic cell. As mentioned previously, the preganglionic cells of the sympathetic nervous system are located between the first thoracic segment and third lumbar segments of the spinal cord. Postganglionic cells have their cell bodies in the ganglia and send their axons to target organs or glands.