Some of the differences that characterize amphibians from birds and reptiles, including the different living and environmental conditions of each of them, and the need for bird embryos to some kind of special care is the incubation of eggs and take care of the fetus after the eggs. The components of the male and female reproductive system, and how the gametes are composed of two types, the type of fertilization and spawning, how to form the plastiola and gastrolla and the composition of the primary line and germ layers and stages of the formation of members of different ages.
Phase of the primary line and the formation of three bacterial layers:
After 3-4 hours of incubation the egg occurs in a quarter of the area of the area and almost become thicker thicker than the rest of this area and this part is the most extensive area of the tail in the fetus and after another three hours more identification of this area and increase in length and increase the age (12 hours) takes elongation And becomes prominent in the center of the transparent area and after 16 hours of incubation accumulate cells forming a dark line known as the primary line This stage is called primary primitive streak is composed of a maze or groove known primitive primer groove and on the sides of two sides or two legs spanning from back to front Or to whichever depart edges primary line primitive ridge and in the introduction to the primary line head low hand there is a little known part of the primitive pit and primitive node in front of this hole there is a high cellular gathering known as node Hensen Hensen`s node is one of embryonic organizations in birds. The area adjacent to the primary line is defined by the embryonic area Embryonalarea. The bacterial disc is transformed from the circular shape to the elliptical shape. The end of the posterior end of the primary line is near the beginning of the dark area and extends to three quarters of the light or transparent area. The tail at the other end of the primary line and the study of a cross-section of the primary line can be seen as a supra-cellular layer called the acetoderm and an inferior cell layer called the endoderm that separates it from the primitive brain. The region that lies directly below the moles and is bounded by the dorsal region of the acetoderm and the ventricular endoderm, represents the point of contact between the cells crawling from the outside in the direction of the mizab primitive and the distinct cells (Actoderm - Endoderm) and from this area, The stage of the primary line is the first stage of differentiation in the embryos of birds and is similar to the stage of gastrolla in amphibians. Through the hole of the gastrolla, the surface cells were merged and differentiated into the bacterial strata as well as in the primitive line where the cells Surface microdermal dermis is located on the sides of the primary line and is spread on the sides. The mismoderm layer is differentiated as a medium layer and is bounded by the dorsal layer of the acetoderm. The small cells are coherent, while the endoderm is dissociated.
Phase of the primary line and the formation of three bacterial layers:
After 3-4 hours of incubation the egg occurs in a quarter of the area of the area and almost become thicker thicker than the rest of this area and this part is the most extensive area of the tail in the fetus and after another three hours more identification of this area and increase in length and increase the age (12 hours) takes elongation And becomes prominent in the center of the transparent area and after 16 hours of incubation accumulate cells forming a dark line known as the primary line This stage is called primary primitive streak is composed of a maze or groove known primitive primer groove and on the sides of two sides or two legs spanning from back to front Or to whichever depart edges primary line primitive ridge and in the introduction to the primary line head low hand there is a little known part of the primitive pit and primitive node in front of this hole there is a high cellular gathering known as node Hensen Hensen`s node is one of embryonic organizations in birds. The area adjacent to the primary line is defined by the embryonic area Embryonalarea. The bacterial disc is transformed from the circular shape to the elliptical shape. The end of the posterior end of the primary line is near the beginning of the dark area and extends to three quarters of the light or transparent area. The tail at the other end of the primary line and the study of a cross-section of the primary line can be seen as a supra-cellular layer called the acetoderm and an inferior cell layer called the endoderm that separates it from the primitive brain. The region that lies directly below the moles and is bounded by the dorsal region of the acetoderm and the ventricular endoderm, represents the point of contact between the cells crawling from the outside in the direction of the mizab primitive and the distinct cells (Actoderm - Endoderm) and from this area, The stage of the primary line is the first stage of differentiation in the embryos of birds and is similar to the stage of gastrolla in amphibians. Through the hole of the gastrolla, the surface cells were merged and differentiated into the bacterial strata as well as in the primitive line where the cells Surface microdermal dermis is located on the sides of the primary line and is spread on the sides. The mismoderm layer is differentiated as a medium layer and is bounded by the dorsal layer of the acetoderm. The small cells are coherent, while the endoderm is dissociated.
