neuroblast
A blast cell from which a neuron develops.
QR
Postembryonic neuroblast, migrates anteriorly.
QL
Postembryonic neuroblast, migrates posteriorly.
G cell
Ventral ganglion neuroblasts present at hatching, located near the excretory pore.
W cell
Postembryonic neuroblast, analogous to Pn.a cells, also known as P0.
Q cell
One of a pair of lateral neuroblasts that migrate separately within the body cavity during larval stages to produce a variety of cell types.
retrovesicular ganglion
Ganglion that lies at the anterior limit of the ventral nerve cord, near the ventral ganglion and nerve ring in the head posterior to the excretory pore. It is open and continuous with the region containing the motoneurons of the ventral cord. In the early L1 this ganglion holds 12 neuron cell bodies plus one neuroblast (Sulston and Horvitz, 1977; White et al., 1986). In the adult animal, the ganglion holds 20 neuron cell bodies.