Normal Chicken Embryo Development By Akrum Hamdy Extra

Normal Chicken Embryo Development By Akrum Hamdy

Extra embryonic Membranes • • Protect and nourish the embryo Terrestrial vertebrates have four extra embryonic membranes 1. 2. 3. 4. chorion amnion allantois yolk sac

1. The chorion and amnion enclose the embryo – The chorion surrounds the entire embryo • – in birds and reptiles it functions in gas exchange The amnion encloses the embryo and forms an open volume between the embryo & the amnion called the amniotic cavity • The amniotic cavity fills with amniotic fluid, which envelops the embryo and cushions it 2. The allantois is an outgrowth of the gut • In reptiles and birds, it stores nitrogenous wastes 3. The yolk sac encloses the yolk in vertebrates with yolk-rich eggs – In humans, there is no yolk sac, but the yolk aids in formation of red blood cells

Extra embryonic Membranes

Primitive streak & groove Credit: © Carolina Biological/Visuals Unlimited Chicken embryo, 21 hours. 310816

heart somites Spinal chord amnion Credit: © Carolina Biological/Visuals Unlimited Chicken embryo, 43 hours. 310877

eye allantois h e a r t amnion Spinal chord somites Credit: © Carolina Biological/Visuals Unlimited Chicken embryo, 60 hours. 310880

Credit: © Carolina Biological/Visuals Unlimited Chicken embryo, 8 days. 310882

Credit: © Carolina Biological/Visuals Unlimited Chick embryo, 9 days. 214169

Effect of aspirin in chick embryo development • Each group will set up three containers – Each container has one chick embryo, 2 additional albumens 1. Negative control 2. Negative control (Ringers solution) 3. Experimental (aspirin in ringers solution)

Effect of aspirin in chick embryo development – Keep everything as sterile as possible!! – Make observations daily (except weekends) – Share observations with other members of your group – Make drawing and written descriptions of your observations.