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DB1 DB2 DB3 DB4 DB5 DB6 DB7
|Ventral cord motor neuron||AB.plpaaaapp AB.arappappa AB.prpaaaapp AB.prpappapp AB.plpapappp AB.plppaappp AB.prppaappp||
Body; Ventral cord
Ventral cord "dorsal B " motor neurons. These neurons innervate dorsal muscles.
Functions: Forward locomotion. DB's receive input from the command interneurons, AVB and PVC. They send output to VD neurons. See Locomotory circuit.
Schematic Diagrams of Ventral Cord motor neurons:
|AS neurons||DA and DB neurons||VA neurons|
|VB neurons||VC neurons||DD and VD neurons|
In all diagrams,axon processes with neuromuscular synapses (NMJ) are shown as whereas dendritic processes where synaptic inputs are received are shown as .
Class A axons run forward in both cords (VNC and DC) whereas the class B axons run backwards. The dendritic branches of the dorsal and ventral class A neurons run in opposite directions as do those from class Bneurons. Ventral class D neurons receive their synaptic input on the dorsal side and give NMJ's on the ventral side. The dorsal type D neurons have half the periodicity of their ventral counterparts and receive synapses on the ventral side and give NMJ's on the dorsal side. Class AS neurons only synapse on the dorsal side and have no ventral counterpart, whereas, the class C neurons only synapse on the ventral side. The synapses from class C motor neurons onto body muscles are less dense than for the other classes (White J. et al, 1976)