Neurula n. : An embryo or certain invertebrates in the stage when the primitive band is first developed.

Example:
What is gastrula and Neurula stage of a frog's embrology?

Taxonomy
Neurula, neural tube, fold, neural plate, free encyclopedia, neurulation, fuse, neural folds, thickening, ectoderm, neural tube defects, notochord, incidence, search, early stage, development of the nervous system, the brain, tissue.

Defination from the web:
Neurula involves the formation of an internal neural tube from an external sheet of cells. ... neurulation/neurula. Notochord · Neuroectoderm · Neural plate · Neural folds · Neural groove ... "http://en.wikipedia.org/wiki/Neurula" Categories: Developmental biology stubs | Embryology ...