All major organs have neurons, or at the very least project axon "fibers" (but the heart specifically has full nerve bundles). They make up the autonomic nervo

All major organs have neurons, or at the very least project axon "fibers" (but the heart specifically has full nerve bundles). They make up the autonomic nervous system, which is the network of motor and sensor neurons connected to the central nervous system (brain and spinal cord). The latter does your thinking, the former keeps you from suffocating.