neu·ru·la 
(nrə-lə, -yə-lə, nyr-)
(nrə-lə, -yə-lə, nyr-)n. pl. neu·ru·las or neu·ru·lae (-lē)
An embryo at an early stage of development in which neurulation begins.
[New Latin : from Greek neuron, sinew, string, nerve; see (s)neəu- in the Appendix of Indo-European roots + Latin -ula, feminine diminutive suffix.]