Final answer:
The three layers of the gallbladder are the inner mucosa, the middle muscularis, and the outer serosa. There's no submucosa in the gallbladder's wall.
Step-by-step explanation:
The gallbladder has three primary layers of tissue, known as tunics, each with its distinct role in the functioning of the organ. These are the inner mucosa, middle muscularis, and the outer serosa. It is important to note that there is no submucosa in the gallbladder wall. The mucosa is lined with simple columnar epithelium and arranged in rugae. The muscular coat, constituting the middle layer, comprises smooth muscle fibers that contract to expel the gallbladder's contents into the bile duct. Lastly, the outer serosa is formed by the visceral peritoneum and encapsulates the gallbladder, connecting it to the liver.