Photographic reconstruction of a cross-section of the intestinal wall observed with the objective of 40x. Going from inside the lumen outwards we can see the different layers that form the wall: epithelium, submucous and muscular layer. The stratified squamous epithelium can be observed, while the outer layers are shown during moulting (arrows). The submucous, of loosely arranged connective tissue, shows great amount of blue-stained collagen fibers, numerous blood vessels and the cells nuclei. Finally, the muscular layer is formed, at this level, by striated fibers and some blood vessels. In the microphotography we can also view a longitudinally cut blood vessel showing abundant red corpuscles inside. Details of the epithelium and the muscular layer appear at higher magnification in other microphotographies (zones framed in red and green, respectively)