<unk>  are cardiopulmonary splanchnic nerves that allows the sympathetic nervous system's stimulation of the heart. They originate from the ganglion cells of the superior, middle, and inferior cervical ganglion of the sympathetic trunk. The<unk> s increases the heart rate. It causes the heart to beat with more force, which then increases blood pressure. While<unk> s increases the heart rate which then increase blood pressure, accelerans nerve speeds it up by emitting noradrenaline. This results in an increased bloodflow.<unk> s also play an important role in controlling heart rate in birds.
Accelerator nerve
Postganglionic nerve fibers
Preganglionic nerve fibers
Nociceptor
Cardiopulmonary nerves
Efferent nerve fiber
Neurovascular bundle
Sensory nerve