Which nerve is NOT involved in the innervation of the gallbladder?

The lesser splanchnic nerve typically provides sympathetic innervation to the abdominal organs, including areas such as the adrenal glands and certain parts of the gastrointestinal tract. However, its involvement with the gallbladder is less direct compared to other nerves that specifically target gallbladder innervation.

The other choices are more involved in directly affecting the gallbladder. The right vagus nerve, for instance, provides parasympathetic fibers that stimulate gallbladder contraction, facilitating the release of bile. The right phrenic nerve plays a role in the sensory innervation, contributing to the sensation of pain from the diaphragm and the adjacent gallbladder area. Meanwhile, the celiac plexus, a network of nerves that offers sympathetic innervation to the abdominal organs—including the gallbladder—plays a crucial role in its overall nerve supply.

Thus, the lesser splanchnic nerve is not primarily responsible for the innervation of the gallbladder, distinguishing it from the other options that have a more direct relationship with gallbladder function.