Figure 1. Ventral cord motor neuron morphology by class. (A) Outgrowth patterns of the nine DA and seven DB cholinergic motor neurons and six DD GABAergic motor neurons that form during embryogenesis. (B) And the same for the 12 VA, 11 VB, 11 AS cholinergic motor neurons and 13 VD GABAergic motor neurons that form during the first larval stage. These are the general morphologies, (see http://wormatlas.org/neurons/Individual%20Neurons/Neuronframeset.html for details on individual neurons). In both (A and B) the left is anterior and top is dorsal. Some of the motor neurons, in general, extend a single long process from the cell body (AS, DD, VD, VA, VB) and others extend two separate long processes (DA and DB), but that these are oriented in different directions along the anterior/posterior (A/P) axis. The DD, VD, DA, and VA neurons extend axons anteriorly, while the DB and VB extend axons posteriorly, and the DA, DB, and AS neurons extend a process dorsally from the cell body, while DD and VD form dorsal processes from the anterior neurite. Note, the hermaphrodite-specific VC motor neurons are not illustrated.