The embryological development of the human eye involves a series of events, beginning with fertilization of the ovum and continuing through the early postnatal period, in three embryonic layers: neural ectoderm
, neural crest, and surface ectoderm, with minor contribution from the mesoderm.
Shows a CCW Rotational Bias While Neuroepithelium Does Not.
Cook (1999) had proposed that metaplasia of mesenchyme of mostly neural ectoderm
, resulting in abnormal differentiation of surface ectoderm, as the most likely mechanism of occurrence of dermoid.
Results suggest that human neural crest cells can arise independently from, and prior to, the formation of mesoderm and neural ectoderm
derivatives, both of which had been thought to be critical for neural crest formation.
Metaplasia of the mesenchyme of the mostly neural ectoderm
resulting in abnormal differentiation of the surface ectoderm has been proposed as the most likely mechanism (Cook 1999).
In the early embryonic epiblast, some cells develop into the neural system and thus become neural ectoderm
, including the neural tube and neural crest.[sup.6,7] The neural tube is a structures that forms the brain, spinal cord, and retinal epithelium.
Because the notochord is surrounded by the muscle, endoderm, and neural ectoderm
, these tissues are thought to affect the orientation of notochord cell movement during convergent extension.
Students use dowels to roll out sheets of blue ectoderm to represent skin and red mesoderm to represent somites, as well as rolling long cylinders representing spinal cord (green neural ectoderm
), notochord (red mesoderm), and gut (yellow endoderm).
NCSCs emerge at the neural plate border between the surface ectoderm and neural ectoderm
and migrate extensively to populate diverse derivatives throughout the body .