Which nerves connect to the heart?

* Vagus nerve (CN X): The vagus nerve provides parasympathetic innervation to the heart. It slows down the heart rate, decreases the force of contraction, and increases the refractory period.

* Sympathetic nerves: The sympathetic nerves provide sympathetic innervation to the heart. They increase the heart rate, increase the force of contraction, and decrease the refractory period.

* Cardiac nerves: The cardiac nerves are a group of nerves that connect the heart to the central nervous system. They carry information about the heart's activity to the brain and spinal cord, and they also carry motor commands from the brain and spinal cord to the heart.