A branch of the Group III afferent synapse an excitatory interneuron, which extends its axon across the midline into the contralateral spinal cord. At that location, the interneuron excites the alpha motor neurons that innervate the extensor muscles of the opposite leg.
The name of the land between two rivers is called Doab. It has 3 districts called Upper or Meerut, Middle or Agra, and Lower or Allahabad Doab.
The map of Mesopotamia shows how civilization sprang up along the banks of the Tigris and Euphrates rivers. It also makes clear why the land earned the nickname; The Land Between Two Rivers. The Tigris & Euphrates rivers have shaped the course of history for this region.