Gallbladder

🩺 Before you name anything

Take a deep breath and let's start by looking at the overall structure of the slide. At low power, you'll notice the gallbladder's mucosa is highly folded, which is a key feature. This folding increases the surface area and is lined by simple columnar epithelium. As you move in closer, you'll see there's no muscularis mucosae or submucosa, which is distinctive. The wall is relatively simple, with a lamina propria and an irregular smooth muscle layer. Many students make the mistake of confusing this with the small intestine due to the folds, but remember, the gallbladder lacks the villi and crypts found in the intestine. Focus on the simplicity of the wall and the absence of certain layers to guide you. This is your way in: identify the folds, confirm the epithelium, and note the absence of muscularis mucosae and submucosa. Keep calm, and you'll do just fine.