At this stage the dark peripheral area opaca and central translucent area pellucida are not distinctly visible.ģ. of 33 Hour Chick Embryo of 11-12 Pairs Somites :Ģ. The extra embryonic area has grown in size.ħ. The foregut and cardiac vesicles are sufficiently developed.ġ3. In the region of head fold the anterior part of neural canal has given rise to a distinct fore brain.ġ2. The mesoderm, in front of Hensen’s node, has given rise to 8-10 pairs of somites.ġ1. The underlying endoderm has transformed into pocket like foregut. In the anterior-most part, the ectoderm has given rise to head fold which is a pocket like extention of neural folds. At this stage embryonic and extra embryonic regions have also become distinguished in the area pellucida.ĩ. Immediately below primitive groove the primitive streak gives rise to the notochord and on either side to mesoderm.Ĩ. The primitive streak and neural groove are separated by Hensen’s node having a small Hensen’s pit in the centre.ħ. The primitive groove is bound by primitive folds.Ħ. In the middle of area pellucida, in the posterior half, runs a primitive streak with a primitive groove running through its centre. At this stage the dark peripheral area opaca and central translucent and clourless area pellucida are distinctly visible.Ĥ. of 30 hours of chick embryo or 8-10 pairs of somite stage of chick embryo.Ģ.
of 30 Hours of 8-10 Pairs of Somites Chick Embryo :ġ. The foregut extends on either side into an amino-cardiac vesicle.Ħ. The neural canal, in the region of head fold, gives rise to forebrain.ġ2. In front of Hensen’s node the mesoderm of embryonic area differentiated into 3-4 pairs of mesodermal somites.ġ1. The underlying endoderm is also transformed into a pocket-like foregut. In the anterior- most part the ectoderm has given rise to head fold, which is a pocket-like extension of neural folds. In the area pellucida embryonic and extra embryonic regions also become distinguished.ĩ. Immediately below the primitive groove the primitive streak gives rise to a small out- growth, the notochord and on either side to mesoderm.Ĩ. The primitive streak and neural groove are separated by Hensen’s node having a small depression in the centre-the Hensen’s pit.ħ. In the anterior half of area pellucida, in the middle, runs the neural groove bound by neural folds.Ħ. The primitive groove is bound by primitive folds.ĥ. In the middle of area pellucida, in its posterior half runs a primitive streak with a primitive groove in its centre. In the anterior part is present the proamnion, which is a small and comparatively more translucent region of area pellucida and is characterised by the absence of mesoderm.Ĥ. of 24 hours 4 pairs of somites stage of chick embryo.ģ. of 24 Hours or 4 Pairs of Somites Stage of Chick Embryo:ġ. The proambion is comparatively reduced in size.ĥ. With the ectoderm the underlying endoderm is also transformed into a pocket-like structure the -foregut.ġ1. In the anterior most part the ectoderm has given rise to head fold, which is a pocket-like extension of neural folds.ġ0. At this stage embryonic and extra ambryonic regions have also become distinguished in the area pellucida.ĩ. The primitive streak gives rise to a small outgrowth, the notochord immediately below the primitive groove and to mesoderm on either side.Ĩ. The primitive streak and neural groove are separated by a thickening, the Hensen’s nod having a small depression in the centre of the Hensen’s pit.ħ. In the anterior part are present the pro-anmnion, which is a small and comparatively more translucent region of area pellucida and is characterised by the absence of mesoderm.Ħ. At this stage the dark peripheral area opaca and central translucent and colourless area pellucida are distinctly visible.ģ. The primitive streak gives rise to an out-growth, the notochord immediately below the primitive groove.ġ. The primitive streak and neural groove is separated by a thickening-the Hensen’s node having a small depression in the centre-the Hensen’s pit.ħ. In the anterior half of area pellucida, in the middle, runs a neural groove bound by neural folds.Ħ. The primitive groove is being bound by primitive folds.ĥ.
In the middle of area pellucida, in the posterior half, runs a primitive streak having a primitive groove through its centre. In the anterior part is present the pro-amnion, which is a small and comparatively more translucent region of area pellucida and is characterised by the absence of mesoderm.Ĥ. At this stage the dark peripheral area opaca and central translucent area pellucida are distinctly visible.ģ. Caudal end of the streak is that which lies close to the area opaca.
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