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Definition
| an elongated band of cells that forms along the axis of an embryo early in gastrulation by the movement of lateral cells toward the axis and that develops a groove along its midline through which cells move to the interior of the embryo to form the mesoderm |
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Definition
| a knob of cells at the anterior end of the primitive streak that is the point of origin of the embryonic head process |
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Definition
| the translucent central area of the blastoderm of birds within which the embryo develops. |
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Definition
| A ventral folding of the cephalic extremity in the embryonic disk, so that the brain lies in a rostral direction to the mouth and pericardium. |
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Definition
| Either the anterior opening leading from the central canal of the embryonic neural tube to the exterior |
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Definition
| A dorsal tubular structure in the vertebrate embryo formed by longitudinal folding of the neural plate and differentiating into the brain and spinal cord. |
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Definition
| one of the paired folds lying on either side of the neural plate that form the neural tube. |
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Definition
| A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae. |
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| the opaque area of the blastoderm surrounding the area pellucida. |
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Term
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Definition
| an area in the anterior part of the blastoderm of an early amniote embryo that is free of mesoderm |
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