page_title: Koller's sickle
hierarchical_section_title: Koller's sickle
caption_attribution_description: Image of avian gastrulation and Koller's sickle's role
context_page_description: In avian gastrulation, Koller's sickle is a local thickening of cells at the posterior edge of the upper layer of the area pellucida called the epiblast. Koller's sickle is crucial for avian development, due to its critical role in inducing the differentiation of various avian body parts. Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation. Avian gastrulation is a process by which developing cells in an avian embryo move relative to one another in order to form the three germ layers.
context_section_description: In avian gastrulation, Koller's sickle is a local thickening of cells at the posterior edge of the upper layer of the area pellucida called the epiblast. Koller's sickle is crucial for avian development, due to its critical role in inducing the differentiation of various avian body parts. Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation. Avian gastrulation is a process by which developing cells in an avian embryo move relative to one another in order to form the three germ layers (endoderm, mesoderm, and ectoderm).
caption: Avian epiblast differentiation. Koller's sickle composes the blue-colored area in image D, associated with the green-colored area opaca and the red-colored area pellucida.[1]
exif: {"Image Orientation": "Horizontal (normal)", "Image XResolution": "23327/100", "Image YResolution": "23327/100", "Image ResolutionUnit": "Pixels/Inch", "Image ExifOffset": "90", "EXIF ExifImageWidth": "1967", "EXIF ExifImageLength": "1968"}