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The Embryonic Development of Chickens and Humans
Transcript of The Embryonic Development of Chickens and Humans
of Chickens and Humans Day 3 On the third day, the nostrils, wings, and legs begin to form. Also, the embryo weighs 0.02 gm. Day 2 On the second day, the heart and the ears form. Plus, the heart starts beating 42 hours after it starts developing. Lastly, the embryo weighs 0.003 gm. Day 4 On the fourth day, the tongue starts to form. Also, the embryo weighs 0.05 gm. Day 5 On the fifth day, the reproductive system begins to develop. You can determine the gender at this stage. Also, the embryo weighs 0.13 gm. Day 6 On the sixth day, the beak and the egg tooth both begin developing. Also, the embryo weighs 0.29 gm. Day 7 On the seventh day, the beak continues to form. Also, the embryo weighs 0.57 gm. Now the embryo is over 1/2 a gram. Day 8 On the eighth day, the feathers start forming. Also, the embryo weighs 1.15 gm. Now the embryo is over 1 gram. Day 9 On the ninth day, the feathers continue developing. Also, the embryo weighs 1.53 gm. Day 10 On the tenth day, the beak begins hardening. Also, the embryo weighs 2.26 gm. Day 11 On the eleventh day, the legs and wings continue developing. Also, the embryo weighs 3.68 gm. Day 11 On the eleventh day, the legs and wings continue developing. Also, the embryo weighs 3.68 gm. On the twelfth day, the legs are almost fully developed. Also, the embryo weighs 5.07 gm. Day 12 Day 13 On the thirteenth day, scales and claws appear on the legs. The legs are fully developed. Also, the embryo weighs 7.37 gm. Day 14 On the fourteenth day, the embryo gets in the best position for hatching. Also, the embryo weighs 9.74 gm. Day 17 On the seventeenth day, the chick turns toward the air cell and breaks it. Also, the chick weighs 18.59 gm. Day 16 On the sixteenth day, the scales, claws, and the beak become hard. Also, the embryo weighs 15.98 gm. Day 15 On the fifteenth day, the embryo starting to gather more weight and strength. Also, the embryo weighs 12.00 gm. Day 18 On the eighteenth day, the chick can be heard peeping. Also, the chick weighs 21.83 gm. Day 19 On the eighteenth day, the yolk is almost completely absorbed. The chick can now communicate with the other chicks and the mother. The chick weighs 25.62 gm. Day 20 On the twentieth day, the yolk is completely absorbed. There is no more room in the egg except for the air cell. The chick weighs 30.21 gm. Chicken Vocabulary Blastoderm-The layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.
Fertilization-An act, process, or instance of fertilizing.
Yolk Sac-An extraembryonic membrane that encloses the yolk of eggs in birds, reptiles, and marsupials and that circulates nourishment from the yolk to the developing embryo.
Amnion-The innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
Chorion-The outermost of the extraembryonic membranes of land vertebrates, contributing to the formation of the placenta in the placental mammals.
Allantois-A membranous sac growing out of the ventral surface of the hind gut of embryonic reptiles, birds, and mammals. It combines with the chorion to form the mammalian placenta
Vitelline Membrane-The membrane surrounding the egg yolk.
Albumen-The white of an egg.
Air Cell-A cavity or receptacle containing air.
Chalaze-One of the two albuminous twisted cords which fasten an egg yolk to the shell membrane. Human Development:
End of First Gestation Period At this stage, there are only a few differences between a human and chicken in appearances. The first gestation period is from the first day to the thirteenth week.
Multiple things are going on:
-The formation of the yolk sac.
-The embryonic cells flatten into a disc.
-The primitive streak develops. Human Development:
End of Second Gestation Period At this stage, there are some differences starting to occur, but they are still similar. The second gestation period is from the fourteenth week to the twenty-eighth week.
Multiple things are going on:
-The fetus starts moving around.
-More muscle and bone cells are forming.
-Certain bones are starting to harden. Human Development:
End of Third Gestation Period At the end of the third gestation period, the baby is fully developed. The baby would soon be born. Even though it would have been born, the baby would continue to develop until it was an adult.