The process in which a branchiomotor neuron growth cone in the branchial arch mesenchyme is directed to a specific target site in the branchial arch mesenchyme in response to a repulsive chemical cue. Branchiomotor neurons are located in the hindbrain and innervate branchial arch-derived muscles that control jaw movements, facial expression, the larynx, and the pharynx.
negative chemotaxis of branchiomotor neuron axon in branchial arch mesenchyme