24-hr-chick-aguit.docx

24 Hr Chick 1.) In the 24-hr chick embryo, the anterior portions of the neural tube are formed through primary neurulation while the caudal part is formed through secondary neurulation. In the frog embryo, Most of the tadpole neural tubes is formed through primary neurulation while the tail is derived from secondary neurualtion. In addition, the neural plate lengthens and narrows by convergent extensions in both the amphibian and chick embryo. 33 Hr chick 3.) in Chicks as well as other vertebrates, the Hensens node secrete proteins that dorsalize the ectoderm and endoderm. These proteins proteins secreted are chordin, Noggin, and nodal, where they repress the BMP or bone morphogenetic proteins. In addition, the Hensen’s node will become the spinal cord upon maturation. 48 Hr chick 3.) some accurate ways to describe and identify the age of the developing chick embryo is through looking at the number of somites present. The development of the somites into sclerotome, myotome and dermatome may help in determining the age of the chick embryo. 72 Hr Chick. 4.) The difference between the Leg bud and the Wing bud in serial sections is that the Leg buds are found at the level of the posterior intestinal portal while the wing buds are found at the level of the cranial intestinal portal. In addition, the wing buds appear as conical bulges on each side of the body.