These images show cross sections of the different compartments of the developing gut in a chick embryo: esophagus (top), small intestine (middle), and large intestine (bottom), at days 6, 8, 10, and 14 (left to right). As the chick develops, the shape of the gut changes from a simple tube to a more complex form with specific surface folding patterns. The way the surface is … Continue reading Tubular