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Syncytium
A structure with many nuclei and a common cytoplasm
Cellular Blastoderm
Early stage of Drosophila development, Once nuclei adopt cell membrane.
Gastrulation
Movement of cells from outside embryo, in.
Dorsal
Spinal side, Back in Drosophila
Ventral
Belly Side
Anterior
Head End
Prosterior
Tail End
Delamination
Neuroectoderm cells enlarge and move inside the embryo.
Metamorphis
Second stage of Drosophila Neurogenesis.
Fascicle
Bundle of Nerve Fibres
Commissure
Bundle of axons crossing midline, connecting to structures on either side.
Blastocoel
Fluid filled cavity found in vertebrate embryo's.
Epiblast
Layer of cells which give rise to 3 germ cell layers.
Area Pellucida
Clear trasparent central layer of epiblast.
Area Opaca
Opaque rind surrounding center of Epiblast.
Koller's Sickle
Small crescent shaped ridge in prosterior of area pellucida.
Primitive Streak
Epiblast cells moving anteriorly from Koller's Sickle.
Henson's Node
Bulge formation at the anterior tip of the primitive streak.
Convergent-Extension
Process of extension of Henson's Node to form Notochord.
Rhombomeres
A series of anatomically distinguishable tissue blocks in hindbrain.
Blastocyst
Mammalian embryo prior to gastrulation.
Anencephaly
Cranial neural folds do not fuse , brain missing.
Spina Bifida
Failure for the neural tube to close at caudal end.
