4. Inside a Chicken Egg AIR CELL SHELL GERMINA DISC CHALAZA YOLK THICK ALBUMIN
5. Inside a Chicken Egg Day 1 Day 6 Day 13 The egg is fertilized. The zygote divides and begins to grow. The cells segregate into groups of specialized function. The embryo nearly stops growing between laying and incubation. The beak becomes visible. The wing bends at the elbow. The allanto is begins to fuse with the chorion. The ribs begin to appear The gizzard begins to form. The intestines begin to loop. Fingers of the wings are covered with feather papillae. The left and right collar bones fuse to form the wishbone.
6. From Egg to Chick Day 17 Day 21 The beak turns towards the air cell. Exhausted ,wet and alive. The chick has hatched!
