The gallbladder and biliary tree receive parasympathetic, sympathetic, and sensory innervation:

The parasympathetic innervation happens through the vagus nerve (CN X). The fibers of the vagus nerve innervate the gallbladder, common bile duct and hepatopancreatic ampulla either directly (usually branches of the left vagus nerve) or through the hepatic plexuses.
The sympathetic innervation is mainly provided by the splanchnic nerves (T7 - T9) (Read more!) that reach the liver via the celiac plexus.
The sensory innervation comes from the right phrenic nerve.

The smooth muscle cells within the gallbladder contract in response to the hormone cholecystokinin and vagal stimulation. In contrast, muscles of the gallbladder relax in response to sympathetic stimulation.

Hepatic plexuses

The liver has two plexuses - anterior and posterior hepatic plexuses. They not only supply the liver but also the biliary tract. Both plexuses communicate with each other.

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Innervation