The drawing at the left side is a histology slide of the stomach wall, and the coloring is really distinct because it’s likely using a stain. The bright red, thick bands running through the middle are the muscularis layers. The stomach is unique because it has three layers of smooth muscle (oblique, circular, and longitudinal) to help churn food, which is why those muscle fibers look so dense and organized here. Off to the right, you can see the mucosa layer. It’s got these wavy, finger-like folds called rugae that increase the surface area. If you look closely at the pits in that layer, that's where the gastric glands are located The text below the image basically sums up the function.
The drawing at the left side is a histology slide of the stomach wall, and the coloring is really distinct because it’s likely using a stain. The bright red, thick bands running through the middle are the muscularis layers. The stomach is unique because it has three layers of smooth muscle (oblique, circular, and longitudinal) to help churn food, which is why those muscle fibers look so dense and organized here. Off to the right, you can see the mucosa layer. It’s got these wavy, finger-like folds called rugae that increase the surface area. If you look closely at the pits in that layer, that's where the gastric glands are located The text below the image basically sums up the function.