Is there a name for a design pattern that implements a workflow orchestration using messages passed through queues?

Basically, I want to implement a workflow like

        B0---C0
       /        \
 A ---B1-----C1--D----E----F
       \        /
        B2---C2

using only message queues. I'm thinking that every message will be sent to a forwarder/dispatcher that has logic like

switch message_result
   case A
        split to B0,..,BN and forward to service that processes Bis to Cis
   case Ci
        if is final Ci
            aggregate Cis into D and forward to service that processes D
        else
            add to collection of accumlated Cis
   case E
        do something with result and forward to F

Is there a name for this type of pattern?