NEUR-u-LAY-shun Physical contact between the notochord and nearby ectoderm that triggers formation of the nervous system. 226, 620
External changes along the upper surface of a chordate embryo that result in the formation of the neural tube.
The process of the formation of the neural plate and subsequently, the neural tube.
the process of forming a dorsal ectodermal tube -- the neural tube.
The earliest stage in the development of the nematode nervous system, occurring between 230-340 min of embryogenesis, when epidermal blast cells ingress into the developing gastrula and divide to produce neuroblasts, which in turn begin to establish the early architecture of the nervous system by forming organized groups of cell bodies within the bodywall (Wadsworth and Hedgecock, 1992, 1996).
Neurulation is a part of organogenesis in vertebrate embryos. Steps of neurulation include the formation of the dorsal nerve cord, and the eventual formation of the central nervous system. The process begins when the notochord induces the formation of the central nervous system (CNS) by signaling the ectoderm germ layer above it to form the thick and flat neural plate.