Structure/Morphology
The serosa is the outer membrane covering the gallbladder. It consists of an external layer of secretory epithelium and a deep layer of connective tissue applied to the external surface of the gallbladder (perimuscular fibrous layer). It covers most of the fundus, inferior surface, and sides. The serosa normally does not extend onto the surface of the gallbladder that is adherent to the liver.
Related parts of the anatomy
Key Features/Anatomical Relations
The serosa of the gallbladder is the part of the visceral peritoneum. The gallbladder is attached to the inferior surface of the right lobe of the liver by the serous coat. The anterior-most portion of the gallbladder, the fundus, usually projects beyond the anterior border of the liver. It can extend far enough to contact the anterior abdominal wall; in which case the parietal peritoneum of the anterior abdominal wall and the visceral peritoneum of the gallbladder minimize contact friction.
Function
The serosa of the gallbladder secretes serous fluid into the peritoneal space, and it lubricates movement of abdominal contents, in this case the gallbladder, as they rub against each other.
